3. how does sexual reproduction happen in animals?
a. when sperm cell and egg cell unite.
b. when 2 sperm cell unite with 1 egg cell.
c. when 2 sperm cell unite with 2 egg cells.
d. when sperm cell unite with another sperm cell.

4. chicks are hatched from eggs. Goats are born alive and look like its parent. frogs undergo many changes as they grow. What do these observations prove?
a. all animals are born alive.
b. all animals are hatch from eggs.
c. different animals move in different ways.
d. different animals reproduce in different ways.

5. why is reproduction important to living organisms?
a. it controls the body parts.
b. it converts food into nutrients.
c. it collects and remove wastes.
d. it ensured continued existence of the organisms.