| A | B |
|---|
| abdomen | the third body part of insects, spiders, and crustaceans |
| air sac | a structure inside an insect's body that is similar to a lung |
| ameba (amoeba) | a common protozoan without a definite shape |
| amebic dysentery | a disease caused by amebas in the digestive tract |
| Anopheles | the genus of mosquito that spreads malaria |
| ant | a social, wingless insect of the order Hymenoptera |
| antenna | a long, movable structure on the head of insects and certain other invertebrates used to feel, hear, and taste |
| aphid | a tiny, sucking insect of the order Homoptera that feeds on juice from the stems and leaves of plants |
| plant louse | another name for an aphid |
| arachnid | a member of the class of arthropods that have four pairs of legs and breathe by book lungs or breathing tubes |
| arachnid | class of arthropods that include the harvestman, mite, scorpion, spider, and tick |
| arthropod | any member of the large phylum of invertebrates with paired, jointed appendages and segmented bodies |
| arthropod | phylum that includes arachnids, centipedes, crustaceans, insects, and millipedes |
| ballooning | the method of locomotion used by some young spiders to sail on silk strands from their birthplace to new homes |
| barnacle | a small saltwater crustacean that attaches itself to rocks and ships |
| bee | a social, flying insect of the order Hymenoptera having two pairs of wings and antennae that are longer than its head |
| beetle | any insect of the order Coleoptera |
| beetle | insect with chewing mouthparts and hard forewings that form a straight line down the back |
| bivalve | a mollusk having two matching, fan-shaped shells joined by hinges |
| bivalve | includes clams, mussels, oysters, and scallops |
| black widow | a poisonous American spider with a glossy, black body and a red hour-glass shape on its abdomen |
| book lung | a special breathing organ stacked like pages in a book used by spiders and some scorpions |
| brine shrimp | a tiny crustacean found in marshes and salt lakes |
| brown recluse | a small but extremely poisonous American spider recognized by a dark violin-shaped mark on top of its body |
| butterfly | an insect of the order Lepidoptera having a slender body and thin antennae with knobs at the ends |
| calcium carbonate | mineral that is the chief ingredient used in the formation of seashells |
| carapace | the broad, protective shell of a crab, turtle, or armadillo |
| caterpillar | the larva of a moth or butterfly |
| cave pearl | a calcium carbonate sphere formed in cave pools |
| centipede | a many-legged arthropod having a flat body and one pair of legs per body segment |
| cephalopod | any member of a class of mollusks with a dome-shaped foot and a number of tentacles |
| cephalopod | includes the cuttlefish, nautilus, octopus, and squid |
| cephalothorax | a main body portion composed of both the head and thorax, as found in most crustaceans and many arachnids |
| chigger | the tiny, red parasitic larva of certain mites |
| chitin | the material that makes up the exoskeleton of arthropods |
| cicada | a large, sucking insect of the order Homoptera that feeds on roots |
| cilia | hairlike projections on a paramecium |
| clam | a bivalve shellfish (mollusk) used for food |
| class | a division of plants or animals that is smaller than a phylum but larger than an order |
| classification | the arrangement of animals or other things into groups according to their similarities |
