20. What is incubation?
A Female birds lay eggs on land
B Male or female birds keep their eggs
warm with their body heat
C Female birds keep their eggs warm with
their body heat
D Birds feed and care for their babies
21. Question 5
A
B Male or female birds keep their eggs
warm with their body heat
C
D
28. How do dolphins
breathe oxygen?
A They breathe at the water’s surface
B They breathe with gills
C They breathe oxygen from the water
D They do not breathe oxygen, they
breathe hydrogen
33. What characteristics do
not describe reptiles?
A They have a tail
B They have a body covered with scales
C Most are terrestrial
D They breathe through gills
45. What characteristics do
not describe sharks?
A They have two flippers and a tail
B The have skeletons made of cartilage
C They breathe through gills
D They have sharp teeth
49. What does warm-
blooded mean?
A Their body temperature always changes
B They can keep their body temperature
cold when it is hot outside
C They can keep their body temperature
constant when the outside temperature changes
D They cannot keep their body temperature
constant when the outside temperature changes
50. Question 12
A
B
C They can keep their body temperature
constant when the outside temperature changes
D
53. What characteristics
describe bony fish?
A They live only in the sea
B They have skeletons made of bones
C They breathe oxygen at the water’s surface
D They have their body covered with fur
61. What of these
characteristics do ONLY
amphibians have?
A Their appearance changes completely
B They are oviparous
C They have a head, trunk and limbs
D Some have tails