Monday, March 30, 2020

Spiders Essays (1290 words) - Spider Anatomy, Spider,

Spiders Spiders This report deals with testing the toxicity of certain chemicals on spiders, and determining the toxicity by how it affects it's ability to weave it's web. This report contains research on the four chemicals (benzedrine, chloral hydrate, caffeine, and alcohol) as wellas the spiders and their webs. Spiders are of course found in the class Arachnidia, which also contain mites, scorpions, and other arthropods. The order which spiders are classified under is called Araneae, a word of Latin origin. Most spiders are land dwelling, but some can be aquatic. Those that are aquatic spend most of their lives in or around water. Spiders can live in a vast amount of different places around the world. Jumping spiders have been collected on Mt. Everest at a height of 22,000 feet, the highest elevation at which any animal has been collected (Orkin, Insect Zoo 1). Adult species vary greatly in size, which is a contributing factor in the prey they choose, and also the way they catch this prey. Spiders range from less than three hundredths of an inch to more than 10 inches. All spiders are carnivorous in their eating habits, insects being first on their menu. Spiders usually catch live animals because the movement of the prey attracts its attention. Some spiders have poor vision, and rather depend on the movement of it's web to locate an insect. (Orkin, Insect Zoo 2). The prey is usually wrapped in silk before the spider injects the venom to kill it. Yet the larger the spiders, the larger its prey. Some spiders have been known to kill vertebrate animals, such as fishing spiders, who thrive on small fish, or bird spiders, feeding on small birds from South America, as well as a variety of lizards. Some species have even been known to attack snakes. When food is scarce, mainly during winter months, spiders have no trouble have no trouble with food, most can go months without eating. A spider's structure is irregular when compared to other animals, yet similar to those of other arachnids. An arachnid is of course classified on the number of it's legs, which happens to be eight. Spiders have two main body regions: the cephalothorax and the abdomen . The cephalothorax consists of the head and the thorax, which are fused together. Insects have three main body regions, a head, thorax, and abdomen. Other arachnids have those two regions connected through a broad waist. All spiders also have simple eyes, lacking compound eyes only found in insects. Spiders can have many pairs of eyes however, this number often reaches four. Spiders do not have an antenna either. (Orkin, Insect Zoo 6) Many spiders secrete a fluid in their posterior abdomens which is later extruded as a silk. This fibrous protein is used to weave webs, snares, shelters, and/or egg sacs. A spider uses fingerlike spinnerets to disperse this silk. Most spin more than one kind of silk to customize its web, or to just fit its purpose. For example, the spider makes some parts of its web not sticky so that it can run across it and not get caught. Another source says that spiders first lay down a type of silk known as ?dry thread?, with which they weave a ?dry spiral. Once this is completed, the spider lays down a sticky spiral of thread and goes on to eat the dry one. The sticky spiral must be replaced every couple days because it loses its ?stickiness.? Some scientists suggest that the pattern of an orb web (most common type of web used by spiders) is designed to attracted insects. These webs are thought to produce patterns that resemble those reflected by numerous flowers in UV light. Since insects only see in UV light, they might as well fly into a trap (Lyons, Spider Silk 1). Spider silk has been recognized for centuries as a high quality fiber. A few pairs of stockings and gloves have been made from the silk as early as the 16th century. Various attempts have been made to produce it commercially, yet have failed. New efforts are currently under construction as more people are finding new ways to use a strong, elastic fiber. A few of these

Saturday, March 7, 2020

Hacer Conjugation in Spanish, Translation, Examples

Hacer Conjugation in Spanish, Translation, Examples One of the most common verbs in Spanish, hacer, which means to make or to do, is highly irregular. This article demonstrates hacer conjugations in the present, past and future indicative, the present and past subjunctive, the imperative, and other verb forms. When conjugating hacer, the a in the stem sometimes changes to e or i, and the c sometimes changes to z or g. The only other verbs that follow the same conjugation pattern are those derived from it, such as contrahacer (to copy or to counterfeit), deshacer (to unmake or undo), and rehacer (to remake or redo). Using the Verb Hacer The verb hacer generally means to do or to make, but it can also be part of other useful expressions. For example, it can mean ago, as in duration of time. Hence, the phrase hace 10 aà ±os means ten years ago, and hace cinco minutos means five minutes ago. The verb hacer is also used to talk about the weather. For example, hace frà ­o means it is cold. You can make the same construction with hace calor, hace viento, hace fresco, etc. (it is hot, windy, cool, etc.). Hacer Present Indicative In the present indicative tense, the only irregular conjugation of hacer is the first person singular (yo). Yo hago I make Yo hago la tarea todos los dà ­as. Tà º haces You make Tà º haces la comida para la familia. Usted/à ©l/ella hace You/he/she makes Ella hace artesanà ­as hermosas. Nosotros hacemos We make Nosotros hacemos ejercicio en el gimnasio. Vosotros hacà ©is You make Vosotros hacà ©is las compras en la tienda. Ustedes/ellos/ellas hacen You/they make Ellos hacen la cama todos los dà ­as. Hacer Preterite Indicative Notice that in the preterite tense, the a in the stem of hacer changes to an i. These are all irregular forms. Yo hice I made Yo hice la tarea todos los dà ­as. Tà º hiciste You made Tà º hiciste la comida para la familia. Usted/à ©l/ella hizo You/he/she made Ella hizo artesanà ­as hermosas. Nosotros hicimos We made Nosotros hicimos ejercicio en el gimnasio. Vosotros hicisteis You made Vosotros hicisteis las compras en la tienda. Ustedes/ellos/ellas hicieron You/they made Ellos hicieron la cama todos los dà ­as. Hacer Imperfect Indicative The imperfect tense is conjugated regularly, using the stem hac plus the imperfect ending for -er verbs (à ­a, à ­as, à ­a, à ­amos, à ­ais, à ­an). Remember that the imperfect can be translated as was making or used to make. Yo hacà ­a I used to make Yo hacà ­a la tarea todos los dà ­as. Tà º hacà ­as You used to make Tà º hacà ­as la comida para la familia. Usted/à ©l/ella hacà ­a You/he/she used to make Ella hacà ­a artesanà ­as hermosas. Nosotros hacà ­amos We used to make Nosotros hacà ­amos ejercicio en el gimnasio. Vosotros hacà ­ais You used to make Vosotros hacà ­ais las compras en la tienda. Ustedes/ellos/ellas hacà ­an You/they used to make Ellos hacà ­an la cama todos los dà ­as. Hacer Future Indicative The verb hacer is irregular in the future tense. Its conjugation starts with the form har-. Yo harà © I will make Yo harà © la tarea todos los dà ­as. Tà º hars Youwill make Tà º harsla comida para la familia. Usted/à ©l/ella har You/he/shewill make Ella har artesanà ­as hermosas. Nosotros haremos Wewill make Nosotros haremos ejercicio en el gimnasio. Vosotros harà ©is Youwill make Vosotros harà ©is las compras en la tienda. Ustedes/ellos/ellas harn You/theywill make Ellos harn la cama todos los dà ­as. Hacer PeriphrasticFuture Indicative The periphrastic future is formed using the present indicative conjugation of the verb ir (to go), the preposition a, and the infinitive hacer. Yo voy a hacer I am going to make Yo voy a hacer la tarea todos los dà ­as. Tà º vasa hacer You aregoing to make Tà º vasa hacer la comida para la familia. Usted/à ©l/ella vaa hacer You/he/shegoing to make Ella vaa hacer artesanà ­as hermosas. Nosotros vamosa hacer We aregoing to make Nosotros vamos a hacer ejercicio en el gimnasio. Vosotros vaisa hacer You aregoing to make Vosotros vaisa hacer las compras en la tienda. Ustedes/ellos/ellas vana hacer You/they aregoing to make Ellos vana hacer la cama todos los dà ­as. Hacer Present Progressive/Gerund Form The equivalent of the English -ing form, gerund or present participle, is the -ando or -iendo form in Spanish. The gerund for hacer is formed regularly, using the ending -iendo. Present Progressive of Hacer est haciendo She is making Ella est haciendo artesanà ­as hermosas. Hacer Past Participle The past participle for hacer is irregular: hecho. One of the main uses of the past participle is to form compound tenses such as the present perfect. Present Perfect of Hacer ha hecho She has made Ella ha hecho artesanà ­as hermosas. Hacer Conditional Indicative The conditional tense is used to talk about possibilities, and is translated to English as would verb. For example,  ¿Quà © harà ­as por tus hijos? (What would you do for your children?). In the conditional indicative, the verb hacer is irregular and uses the stem har-. Yo harà ­a I would make Yo harà ­a la tarea todos los dà ­as si tuviera tiempo. Tà º harà ­as Youwould make Tà º harà ­as la comida para la familia si supieras cocinar. Usted/à ©l/ella harà ­a You/he/shewould make Ella harà ­a artesanà ­as hermosas si pudiera. Nosotros harà ­amos Wewould make Nosotros harà ­amos ejercicio en el gimnasio, pero es muy caro. Vosotros harà ­ais Youwould make Vosotros harà ­ais las compras en la tienda, pero es ms fcil por Internet. Ustedes/ellos/ellas harà ­an You/theywould make Ellos harà ­an la cama todos los dà ­as, pero se les olvida. Hacer Present Subjunctive The present subjunctive is used to talk about doubts, desires, emotions, recommendations, or other subjective situations. Que yo haga That I make La maestra pide que yo haga la tarea todos los dà ­as. Que tà º hagas That you make Tu hijo quiere que tà º hagas la comida para la familia. Que usted/à ©l/ella haga That you/he/she make El vendedor requiere que ella haga artesanà ­as hermosas. Que nosotros hagamos That we make El mà ©dico sugiere que nosotros hagamos ejercicio en el gimnasio. Que vosotros hagis That you make El cocinero sugiere que vosotros hagis las compras en la tienda. Que ustedes/ellos/ellas hagan That you/they make La abuela espera que ellos hagan la cama todos los dà ­as. Hacer Imperfect Subjunctive The imperfect subjunctive is used in similar situations as the present subjunctive, but in the past. There are two options for conjugating the imperfect subjunctive. Option 1 Que yo hiciera That I made La maestra pedà ­a que yo hiciera la tarea todos los dà ­as. Que tà º hicieras That you made Tu hijo querà ­a que tà º hicieras la comida para la familia. Que usted/à ©l/ella hiciera That you/he/she made El vendedor requerà ­a que ella hiciera artesanà ­as hermosas. Que nosotros hicià ©ramos That we made El mà ©dico sugirià ³ que nosotros hicià ©ramos ejercicio en el gimnasio. Que vosotros hicierais That you made El cocinero sugirià ³ que vosotros hicierais las compras en la tienda. Que ustedes/ellos/ellas hicieran That you/they made La abuela esperaba que ellos hicieran la cama todos los dà ­as. Option 2 Que yo hiciese That I made La maestra pedà ­a que yo hiciese la tarea todos los dà ­as. Que tà º hicieses That you made Tu hijo querà ­a que tà º hicieses la comida para la familia. Que usted/à ©l/ella hiciese That you/he/she made El vendedor requerà ­a que ella hiciese artesanà ­as hermosas. Que nosotros hicià ©semos That we made El mà ©dico sugirià ³ que nosotros hicià ©semos ejercicio en el gimnasio. Que vosotros hicieseis That you made El cocinero sugirià ³ que vosotros hicieseis las compras en la tienda. Que ustedes/ellos/ellas hiciesen That you/they made La abuela esperaba que ellos hiciesen la cama todos los dà ­as. Hacer Imperative The imperative mood is used to give direct commands. There are both positive and negative commands. Notice that the second person singular command haz is irregular. Positive Commands Tà º haz Make!  ¡Haz la comida para la familia! Usted haga Make!  ¡Haga artesanà ­as hermosas! Nosotros hagamos Let's make!  ¡Hagamos ejercicio en el gimnasio! Vosotros haced Make!  ¡Haced las compras en la tienda! Ustedes hagan Make!  ¡Hagan la cama todos los dà ­as! Negative Commands Tà º no hagas Don't make!  ¡No hagas la comida para la familia! Usted no haga Don't make!  ¡No haga artesanà ­as hermosas! Nosotros no hagamos Let's not make!  ¡No hagamos ejercicio en el gimnasio! Vosotros no hagis Don't make!  ¡No hagis las compras en la tienda! Ustedes no hagan Don't make!  ¡No hagan la cama todos los dà ­as!