11ResponseReact to environmentUse specialized cells - nerves
12MovementMost animals are motile by muscle contractions
13Reproduction Sexual and Asexual Increase in numbers Sexual helps maintain genetic diversity in populations
14Body SymmetryBilateral: An imaginary plane can divide the body into two equal halves.Example: crayfishRadial: any number of imaginary planes can be drawn through the center, dividing it into equal halvesExample: sea anemone
17Trend in Animal Evolution Complex animals Higher levels of cell specializationHigher levels internal body organizationBilateral body symmetryFront end (head) with sense organs (cephalization)Body cavity formation: fluid filled space that allows for organs to grow & expand.