Place the following hypothesized events of the
beginning of life in their correct order
I organic polymers form
II inorganic molecules form
III DNA-based cells form
IV organic monomers form
V protocells in the RNA world form
a. I, III, V, IV, II d. IV, I, II, III, V
b. II, I, IV, V, III e. II, I, IV, V, III
c. II, IV, I, V, III
C
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Mutations can be
a. random. b. beneficial. c. harmful. d. heritable. e. all of these
Scientists have a complete fossil record showing the evolution of horses over millions of years, with the legs becoming longer and the teeth larger, as ancestors of the modern horse adapted from living in forest to grasslands. This is an example of
A. punctuated equilibrium. B. extinction. C. a postzygotic barrier to evolution. D. gradualism. E. a prezygotic barrier to evolution.
A keystone species that is a predator will
A) maintain the species diversity in a community. B) harvest prey species to extinction. C) help many of its prey reproduce. D) reduce the diversity of the community.
Which disease that affects respiratory function is caused by an infectious organism?
A. lung cancer B. emphysema C. asthma D. cystic fibrosis E. pneumonia