1. A platypus is a vertebrate animal that lays eggs in water, have duckbill features, and feeds its young milk from its mammary glands. In which class of vertebrate does it belong?
a. birds
b. reptiles
c. mammals
d. amphibians

2. Not all birds can fly. Which bird proves this statement?
a. ostrich
b. eagle
c. dove
d. vulture

3. The following vertebrates are reptiles. Which does not belong to the group?
a. frog
b. snake
c. turtle
d. lizard