The nine different classes of vertebrates include
a. four fish classes and amphibians, reptiles, birds, whales and mammals.
b. four fish classes and amphibians, reptiles, birds, mammals and primates.
c. five fish classes and amphibians, reptiles, birds, and mammals.
d. five fish classes and amphibians, reptiles, monkeys, and mammals.

Which of the following is an example of competition a. the leaves of a tree prevent a small shrub from getting sunlight. three species of birds feed a different heights in the same tree. b. three species of birds feed at different heights in the same tree c. zebra and giraffe’s feed on different grassland plants d. cats living in two different homes eat the same brand of cat food.