Question | Answer |
omnivore | animal that eats both plants and animals |
radial symmetry | arrangement of body parts in a circle, around a center point. In math: rotoational symmetry. |
invertebrate | an animal without a backbone |
carnivore | animal that eats only other animals or their remains |
bilateral symmetry | arrangement of body parts in halves that are nearly mirror images of each other. In math: line symmetry |
vertebrate | an animal that has a backbone |
hermaphrodite | an animal that produces both sperm and eggs in the same body |
gill | an organ that exchanges carbon dioxide for oxygen in the water |
open circulatory system | blood circulation system in which the heart moves blood out into open spaces around the body's organs |
closed circulatory system | blood circulation system in which blood moves through the body in a series of closed blood vessels |
crop | digestive system sac |
gizzard | muscular digestive system structure where food is ground up |
appendage | jointed structure such as a leg, pincer or antenna |
molting | shedding and replacing of an arthropod's exoskeleton |
metamorphosis | process in which many insect species chand their body form to become adults |
epidermis | outer most layer of skin |
sponges | invertebrate animal that is assymetrical |
mollusks | soft-bodied invertebrates with bilateral symmetry. They usually have one or two shells. |
gastropod | Largest group of mollusks, with 1 or no shell (univalves). |
bivalves | mollusks that have a hinged, two-part shell joined by strong muscles. |
cephalopods | most specialized and complex mollusks. They have a large, well developed head and a closed circulatory system. |
segmented worms | worms with bilateral symmetry, a body cavity that holds organs, and two body openings |
earthworm | segmented worms known as annelids, with tube-shaped bodies that are divided into many segments. |
marine worms | segmented worms called polychaetes, that live in the ocean. |
leeches | segmented worms that dont' have setae. They feed on the blood of other animals. |
arthropods | Animals with jointed appendages. They have bilateral symmetry, segmented bodies, an exoskeleton, a body cavity a digestive system with two openings and a nervous system. |
insects | arthropods with 3 body regions - head, thorax and abdomen |
arachnids | arthropods with 2 body regions - head-chest region called cephalothorax and an abdomen. they have 4 pairs of legs with no antennae. |
centipedes | arthropods with long segmented bodies , antennae, simple eyes, and 1 pair of legs per body segment. |
millipedes | arthropods with long segmented bodies, antennae, simple eyes, and 2 pairs of legs per body segment. |
crustaceans | arthropods with 1 or 2 pairs of antennae and mandibles (jaws) used for crushing food. They have 5 pairs of legs: 1 pair of claws and 4 pair of legs. Most live in water. |
echinoderms | invertebrates with a hard endoskeleton covered by thin, bumpy, or spiny epidermis. They have radial symmetry, a mouth, stomach and intestines. |