Help me with multiple choice questions!! please!?

Question

1. Since DNA sequences in humans and chimpanzees are very similar,

a. humans must have evolved from chimpanzees.

b. chimpanzees must have single-stranded DNA.

c. humans and chimpanzees must have a recent common ancestor.

d. humans and chimpanzees are the same biological species.

2. Fish produce by all of the following EXCEPT

a. external fertilization, eggs.

b. internal fertilization, live birth.

c. internal fertilization, eggs.

d. external fertilization, live birth.

3. Endothermic metabolism, complete ventricle division in heart, and a very efficient respiratory system are characteristics of

a. reptiles

b. birds.

c. amphibians.

d. fish.

4. Characteristics that give birds the energy they need to fly long distances are

a. strong breast muscles and wings.

b. aerodynamic feathers and lightweight bones.

c. divided ventricle and air sacs in lungs.

d. endothermic metabolism and fused bones.

I think number 4 is confusing!

Thanks =)

Answer 1

c, c, c, b...

:)

Answer 2

1.c

2.d

3.b

4.b

Answer 3

c

d

b

c

Answer 4

1. c. humans and chimpanzees must have a recent common ancestor.

2. d. external fertilization, live birth.

3. b. birds.

4. a. strong breast muscles and wings.

Answer 5

im not exactly sure but im pretty sure.

1. d

2. b

3. d

4. b

yeah thats it. just to let you know i didnt use a source its just my prior knowledge.