| Question | Answer |
| All animals need ______, ______, ______, and protection from ______ and other dangers in the environment. | food, oxygen, water, predators |
| Animals need ______ so they can have the energy to grow and to perform all life processes. | food |
| You can tell an animal's diet by observing its _______. | teeth |
| Animals eat food for energy, but they can't use the energy unless they also have ________. | oxygen |
| Animals get the oxygen they need from the ______, through their __________, and from the _________. | air, (bodies)skin, water |
| All animals are made up of ______ which are mostly water. | cells |
| A ________ is an animal that has a backbone. | vertebrate |
| An _________ is an animal that does not have a backbone. | invertebrate |
| Vertebrates are part of the animal phylum known as __________. | chordates |
| The four characteristics in the development of chordate are: a) every chordate has a __________, b) a __________ that connects the animal's brain with other parts of its body, c) _________, and d) a ______________. | notochord, nerve chord, gill slits, tail |
| The largest group of chordates is the _________. | vertebrates |
| Vertebrates include _______, _______, _______, and _______, and _______. | fish, amphibians, reptiles, birds, mammals |
| Vertebrates differ from other chordates because their notochord develops into a ________. | backbone |
| A vertebrate has an ________-- a system of connecting bones that lie within the animal's body. | endoskeleton |
| Vertebrates make up about ____ % of the animal population. The other ____ % of animals are invertebrates. | 4, 96 |
| Invertebrates include ______, _______, _______, _______, and insects. | sponges, worms, centipedes, mollusks, insects |
| An _________ is a skeleton that is outside of an animal's body for protection and body shape. | exoskeleton |
| Arthropods make up _____ % of the animal population. | 85 |
| Where should you look for invertebrates? | Anywhere |
| A _______ is one type of animal that filters the water it lives in to get food. | sponge |
| A sponge has ________ layers of cells. | two |
| A sponge's skeleton is made up of tiny rodlike structures of tough protein called _______. | spicules |
| A sponge is classified as an animal because it takes in ______ and has moving whiplike structures. | food |
| ________ are carnivorous, or meat-eating invertebrates that have the ability to sting. | Cnidarians |
| What kind of environment do all cnidarians live? | in water |
| What helps cnidarians catch their prey? | stingers |
| Cnidarians have _______ symmetry. | radial |
| A cnidarian that has a vase-shaped form like a hydra is called a _______. | polyp |
| The other form of cnidarian is called a _______. | medusa |
| Sponges have _______ symmetry, cnidarians have _______ symmetry, flatworms and roundworms have _______ symmetry. | no, radial, bilateral |
| A _______ has a flattened body, a digestive system with only one opening, a simple nervous system, and can also harm humans. | flatworm |
| A _______ has a round, tubelike body. | roundworm |
| Roundworms are the only group of worms that have _______ that run lengthwise through the worm's body. | muscles |
| An animal that lives in or on another animal and feeds on that animal is called a _______. | parasite |
| Flatworm parasites include _______ and ______. | tapeworms, flukes |
| Roundworm parasites include ________ and ________. | hookworms, trichinella |
| ____________ are worms whose bodies are made up of connected sections, or segments. | Segmented worms |
| _______ are segmented worms with two openings. | Earthworms |
| To get oxygen, earthworms breathe through their thin, moist __________. | skin |
| A ________ is an animal with a soft body and no bones. It also has a muscular foot that burrows in the sand. | mollusk |
| An example of a mollusk is a(n)__________. | octopus |
| Mollusks include ________, ________, ________, ________, ________, and ________. | clams, oysters, slugs, snails, squid, octopods |
| The shell of a mollusk is formed by an organ called the ________. | mantle |
| Mollusks that have two hinged shells that fit together are called _________. | bivalves |
| Snails have an organ called a _______ that is shaped like a tongue and is coated with ribbons of teeth. | radula |
| ________ and ________ are the most active and most intelligent mollusks. | Octopods, squid |
| An ____________ is an animal that has a jointed exoskeleton. | arthropod |
| __________ attached to the inside of the exoskeleton contract and relax allowing the arthropod to move. | Muscles |
| An arthropod's exoskeleton ___ ____ grow as the animal gets larger. | does not |
| _______ are the largest phylum of animals. | Arthropods |
| ________ are the most numerous arthropods and the most numerous animals on Earth. | Insects |
| How do arthropods help people? 1) They help _______ plants, 2) They eat _______ that destroy crops or flowers. 3) They are a ______ _______ for other animals, and 4) they produce goods that can be ______. | pollinate, insects, food source, sold |
| _________ are invertebrates that have internal skeletons and spines sticking out from their bodies. | Echinoderms |
| The word echinoderm comes from the Latin words meaning _______ and _______. | spiny, skin |
| Examples of echinoderms are ________, ________, ________ (that eat algae), and ________. | starfish, sand dollars, sea urchins, sea cucumbers |
| Echinoderms have _________ along the underside of their arms that they use for _______, _______, ________, and ___________. | tube feet, moving, feeding, sensing, respiration |
| A mosquito is an example of a(n) ______________. | exoskeleton |
| A tiger is an example of a(n)_______________. | vertebrate |
| A starfish is an example of a(n) ___________. | echinoderm |
| An arthropod conceals itself to _____ itself. | protect |
