2. What term refers to those organisms that survive despite the struggle for resources?
(a) Circle of life.
(b) Artificial selection.
(c) Natural selection.
(d) Hereditary modification.

3. Which of the following refers to a scientist who studies living creatures?
(a) Paleontologist.
(b) Naturalist.
(c) Geologist.
(d) Botanist.

4. What tends to occur in large groups of genera?
(a) They live over large areas.
(b) They become varieties.
(c) They never inter-breed.
(d) They divide into smaller groups.

5. What is one function that cave dwelling animals lost through natural selection?
(a) Hearing.
(b) Touch.
(c) Sight.
(d) Taste.

6. Which term refers to a type of variation that is seen in most or all groups of organisms?
(a) Definite variation.
(b) Organism variation.
(c) Species variation.
(d) Indefinite variation.

7. In Chapter 4: Natural Selection, what does Darwin suggest about most variations?
(a) They are helpful for survival.
(b) They are not helpful for survival.
(c) They lead to species regeneration.
(d) They are caused by domestication.

8. What does Darwin say will happen to species that do not adapt?
(a) Nothing.
(b) They are stronger than others.
(c) They are weeded out.
(d) They become smaller in size.

9. What type of relationship do organisms have with one another?
(a) Environmental.
(b) Cooperative.
(c) Competitive.
(d) Genetic.

10. What animal does Darwin use as an example of an intermediate form of a full-land and full-flying animal?
(a) Penguin.
(b) Bat.
(c) Flying squirrel.
(d) Spider monkey.

11. What other actions do birds use their wings for?
(a) Running.
(b) Swimming.
(c) Mating.
(d) Cleaning.

12. What does the absence of complete facts with Darwin's theory open the theory up to?
(a) Failure.
(b) Success.
(c) Confusion.
(d) Objections.

13. What is the primary cause for the struggle for survival between species?
(a) Variation.
(b) Rapid reproduction.
(c) Environmental factors.
(d) Food sources.

14. What do Naturalists suggest is one definite distinction between a species and a variety?
(a) Life span.
(b) Size of groups.
(c) Domestication.
(d) Geographical range.

15. What happens to a species if their traits and characteristics are not passed down to the next generation?
(a) They will grow.
(b) They will become unique species.
(c) They will change.
(d) They will become extinct.