Vocabulary

3. very harmful or unpleasant in a pervasive or insidious way.
5. the science or practice of farming, including cultivation of the soil for the growing of crops and the rearing of animals to provide food, wool, and other products.
6. a small free-swimming crustacean with an elongated body, typically marine and frequently harvested for food.
10. a compound or substance that has been purified or prepared, especially artificially.
12. a bottom-dwelling marine ray with a flattened diamond-shaped body and a long poisonous serrated spine at the base of the tail.
14. a fast-flying long-bodied predatory insect with two pairs of large transparent wings which are spread out sideways at rest.
15. any of a family (Gryllidae) of leaping orthopteran insects noted for the chirping notes produced by the male by rubbing together specially modified parts of the forewings.
16. destroy completely.
18. a small beetle with a domed back, typically red or yellow with black spots. Both the adults and larvae are important predators of aphids.
20. an insect of an order distinguished by forewings typically modified into hard wing cases (elytra) that cover and protect the hind wings and abdomen.

1. the act of contaminating, or of making something impure or unsuitable by contact with something unclean, bad, etc.
2. a substance used for destroying insects or other organisms harmful to cultivated plants or to animals.
4. the paired respiratory organ of fishes and some amphibians, by which oxygen is extracted from water flowing over surfaces within or attached to the walls of the pharynx.
7. a claw (as of a lobster) resembling a pair of pincers.
8. a free-swimming marine coelenterate with a gelatinous bell- or saucer-shaped body that is typically transparent and has stinging tentacles around the edge.
9. the ability not to be affected by something, especially adversely.
11. cephalopods that have eight short arms two longer tentacles, a long tapered body, a caudal fin on each side, and usually a slender internal chitinous support. squid.
13. insects that act as scavengers consuming rotting organic matter.
15. a tiny soft-bodied animal that typically lives within a stony skeleton grouped in large colonies and that is related to the jellyfish.
17. a slender, flexible limb or appendage in an animal, especially around the mouth of an invertebrate, used for grasping or moving about, or bearing sense organs.
19. insect with antennae that is often feathery, with a stouter body, duller coloring, and proportionately smaller wings than the butterflies.