13. The environment on early Earth had violent impacts, volcanic gases, acid rain and unfiltered ultraviolet radiation from the sun. (True or False)
14. The basic ingredients of life included water, carbon and energy (True or False)
15. Life first started out in on the ocean or land)
16. The first organisms to produce oxygen on earth were
a. plants
c. blue-green bacteria
b. animals
b. protozoa
17. The order of organism evolution was
a bacteria, algae, plants and animals c. animals, bacteria, plants and algae.
b. algae, plants, animals and bacteria d. animals, plants, algae and bacteria.
18.
billion years passed between the Big Bang and the appearance of humans.
a. S
c. 20
b. 15
d. 18
19. The gravity of a black hole is strong enough to keep light from escaping. (True or
False)