Essay Instructions: write a 500-700-word paper about the phylum annelida. this is a essay paper on a third year college level in Science i wrote this here because when i was ordering the paper it would not let me choose it at the top. And the lab that i did i paste it at the bottom the paper supose to be on the lab answers i got and this is the answers at the bottom. If you dont understand please contact me as soon as possible so that i can have this paper done before the deadline i gave you guys thanks.
With spiders, the venom they inject into their prey liquefies the insect (or whatever) and the arachnid is then able to drink its dinner. They do have teeth sufficient to inject venom or, in the case of mites and ticks, to break the skin and get to the blood supply.
2.* The body segmented, the segments usually grouped in two or three rather distinct regions - making them highly mobile.
* Paired segmented appendages (from which the phylum gets its name) - making them ambulate & walk easily.
* Bilateral symmetry - making them relate to the environment quite easily.
* A chitinous exoskeleton, which is periodically shed and renewed as the animal grows - making them resistant to shock of hard objects.
* A tubular alimentary canal, with mouth and anus - accounting for good food digestion.
* The circulatory system an open one, the only blood vessel usually being a tubular structure dorsal to the alimentary canal with lateral openings in the abdominal region - ensures better perfusion and less chances of hemolysis due to their being highly mobile.
3.As far as advantages are concerned, the exoskeleton provides a bony plate of armor for support and protection of the soft internal tissues and organs.
Disadvantages; it limits the possible size of the animal. Since the weight of an animal is a function of its volume, a doubling of an animal?s size increases its weight by a factor of 8.. this is the same reason why you don't have rats the size of elephants and vice versa.
Exoskeletons also create difficulties in overall growth, which is why periodic moltings are necessary for the arthropods to increase in size.
Complete Metamorphosis: Egg, Larva, Pupa, Adult.. obvious example would be a butterfly (larve = caterpillar, pupa = crysallis or cocoon, adult = butterfly)
Incomplete Metamorphosis: Egg, Nymph, Adult
Example would be a grasshopper
Nymph is basically a smaller version of an adult - primary difference being no wings. You can distinguish them from complete metamorphosis critters because usually the larval stage of complete metamorphosis looks NOTHING like the adult stage
4.Insecta or Hexopoda (insects) is the most diverse class. There are about 900,000 known insect species, three times as many as all other animal species together, and thousands of new ones are described each year. They are commonly grouped in 27 to 32 orders, depending upon the classification used. The largest order is that of the beetles (Coleoptera). Next, in order of size, are the moths and butterflies (Lepidoptera); the wasps , ants , and bees (Hymenoptera); and the flies and mosquitoes (Diptera). Other major orders are the true bugs (Hemiptera); the cicadas , aphids , and scale insects (Homoptera); the grasshoppers and crickets (Orthoptera); the cockroaches (Blattodea); and the mantids (Mantodea).
Any of numerous usually small arthropod animals of the class Insecta, having an adult stage characterized by three pairs of legs and a body segmented into head, thorax, and abdomen and usually having two pairs of wings. Insects include the flies, crickets, mosquitoes, beetles, butterflies, and bees.
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