Characteristics of Animals

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Animals as Living Things Vocabulary Grade 4

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Presentation transcript:

Characteristics of Animals What are characteristics of animals? Vertebrates or Invertebrates. Bodies are multi-cellular. Heterotrophs - get energy by eating other organisms. Major functions - obtain food, oxygen for energy, keep internal conditions in balance, move, and reproduce.

Invertebrate: SPONGES: How do they get Oxygen: Examples: Pictures:

Invertebrate: Characteristics of SPONGES Simple animals with many pores (holes) through which water flows. Water moves into a central cavity and out through a hole in the top. Get food and eliminate wastes through this passage of water. Have specialized cells for obtaining food and oxygen from the water. They are sessile – don’t move.

CNIDARIANS: How do they get Oxygen: Examples: Pictures:

Invertebrate: Characteristics of CNIDARIANS Found only in water. Have tentacles with stinging cells to capture prey. Have a central opening where food is taken in. Have a simple nervous system to feel prey. Many are sessile – don’t move (jelly fish are not sessile).

SEGMENTED WORMS: How do they get Oxygen: Examples: Pictures:

Invertebrate: Char. of SEGMENTED WORMS Have long tube-like bodies divided into segments. The simplest organisms with a nervous system and blood in vessels. A long digestive tube runs down the length of the worm’s body. Take in oxygen from the water through their skin. EXAMPLES: Earthworms and Leeches.

MOLLUSKS How do they get Oxygen: Examples: Pictures:

Invertebrate: Characteristics of MOLLUSKS Have soft bodies; most have a thick muscular foot for movement or to open and close their shells. Have more developed body systems than sponges or worms. Take in oxygen through gills or lungs, and some have shells. EXAMPLES: slugs, snails, clams, and octopuses.

ECHINODERMS How do they get Oxygen: Examples: Pictures:

Invertebrate: Characteristics of ECHINODERMS Have arms that extend from the middle body outwards. Have tube feet that take in oxygen from the water and spines. EXAMPLES: sea stars, brittle stars, sea cucumbers, or sea urchins.

ARTHROPODS How do they get Oxygen: Examples: Pictures:

Invertebrate: Characteristics of ARTHROPODS Have jointed legs, segmented bodies, and some have wings. They have hard outer coverings called exoskeletons. They obtain oxygen from the air through gills or air tubes. EXAMPLES: insects, arachnids, and crustaceans.