3.3 - Animals

Question 1

Characteristics of animals

Answer 1

Multicellular eukaryotes, heterotrophic, uses aerobic cellular respiration, most are motile (moves), most complex of all organisms

Question 2

Features to classify animals

Answer 2

• Presence of nervous system
• Type of symmetry (radial = symmetry around a central axis, OR bilateral = symmetry around a midline)
• Protostome (mouth develops first) vs. deuterostome (anus develops first)
• Number of germ layers (layers of cells) in developing embryo
• Presence of coelom (body cavity)

Question 3

Phylum chordata characteristics

Answer 3

Gill slits, dorsal nerve cord, notochord attaching body wall muscles.

Includes fish, amphibians, reptiles, birds, & mammals