| A | B |
|---|
| An organism that cannot make its own food and must obtain it from another organism | Heterotroph |
| Having no symmetry; example: ocean sponges | Asymmetrical |
| Having a body arranged around a central point; examples: jellyfish, starfish | Radial Symmetry |
| Having a body that can be divided equally into left and right halves; examples: frogs, humans | Bilateral Symmetry |
| Animals that have backbones | Vertebrates |
| Animals that do not have backbones | Invertebrates |
| Fertilization occurs outside the body | External Fertilization |
| Fertilization occurs inside the body | Internal Fertilization |
| The phylum that contains the simple animals of sponges | Porifera |
| An organism that has both male and female reproductive organs and produce both eggs and sperm | Hermaphrodite |
| The phylum that contains animals that are carnivores, live in water, and have radial symmetry; includes jellyfish, sea anemones, and coral | Cnidaria |
| Animals that eat other animals for food | Carnivores |
| Specialized stinging cells in the tentacles of cnidarians | Cnidocytes |
| A tiny, coiled stinger in the cnidocyte | Nematocyst |
| The body form of a cnidarian that has tentacles pointing upward | Polyp |
| The body form of a cnidarian that has tentacles hanging downward | Medusa |
| The animal phylum that contains flatworms, such as planarians and tapeworms | Platyhelminthes |
| An organism that feeds on another living organism | Parasite |
| The animal phylum that contains roundworms, such as heartworms, hookworms, and pinworms; many of the worms in this phylum are parasitic | Nematoda |
| The animal phylum that contains segmented worms, such as leeches and earthworms | Annelida |
| A phylum of animals called "mollusks," which all have a soft body and a muscular foot | Mollusca |
| A type of mollusk that may or may not have a shell and moves by gliding on a self-secreted slimy track; examples: snails, slugs | Gastropod |
| A type of mollusk that has two shells hinged together but does not have a well-developed head; uses a muscular foot to move or dig into sand; examples: clams, oysters | Bivalve |
| Attached to a solid object | Sessile |
| A type of mollusk that has a head, no body, and a food that is spread out into tentacles; examples: octopuses, squids | Cephalopod |
| A phylum of spiny-skinned animals that have an internal skeletal structure and that live in the ocean; examples: starfish, sea urchins | Echinodermata |
| Tiny tubes that act as suction cups to allow some echinoderms to move and get food | Tube feet |
| The phylum of invertebrates that have joined appendages and segmented bodies covered in an exoskeleton | Arthropoda |
| A hard, protective covering on the outside of an invertebrate's body | Exoskeleton |
| A group of arthropods that usually live in water and have two antennae; examples: lobsters, crayfish, shrimp, pill bugs | Crustaceans |
| A group of arthropods that includes spiders and scorpions | Arachnids |
| Long, worm-like arthropods that move slowly with multiple sets of tiny feet; eat dead and decaying plant material | Millipedes |
| Long, worm-like arthropods that are carnivores; able to move quickly | Centipedes |
| A group of arthropods that have bodies divided into three parts and have three sets of legs; examples: house fly, grasshopper, butterfly | Insects |
| A process that all insects go through as they change and develop from an egg to an adult | Metamorphosis |
| Phylum in the animal kingdom that includes animals and backbones | Cordata |
| Animals that cannot regulate their internal body temperature; body temperature depends on the environment | Ectotherms |
| Animals that can regulate their internal body temperature | Endotherms |
| The movement of an animal from one region or climate to another for a specific period of time | Migration |
| A technique used by some animals to lure prey to them by mimicking something else | Aggressive Mimicry |
| Asleep during the day and awake at night | Nocturnal |
| Awake during the day and asleep at night | Diurnal |
| A resting state of some animals during cold weather when their entire metabolism, including digestion, respiration, and heart rate, slows down | Hibernation |
| A resting state similar to hibernation that some animals use in hot weather | Estivation |
| An adaptation of some animals that helps them to hunt or to avoid predators by having a color that is the same as their environment | Camouflage |
| An adaptation of some animals that causes them to look like something else in their environment; example: an insect may have the same body shape as a leaf | Protective Resemblance |
| A type of protective resemblance that causes an animal to look like something that its predators would rather avoid than eat | Mimicry |
| An adaptation that helps to protect an animal's most vulnerable body part(s) from predators by having one body part look like a different body part | Self-Mimicry |
| A protection adaptation used by some animals that uses color to warn other animals to keep away | Warning Coloration |
