The mass extinction that occurred on earth 65 million years ago was immediately followed by:
a) the rise of archaea.
b) the emergence of the first non-photosynthetic organisms.
c) an increase in atmospheric oxygen levels.
d) the rapid divergence and radiation of modern mammals.
e) the rise of the reptiles, including the dinosaurs.
Ans: d) the rapid divergence and radiation of modern mammals.
You might also like to view...
What kind of signaling is it when nerve cells interact across a synapse?
a. endocrine b. autocrine c. paracrine d. direct signal across gap junctions
Which term refers to a seed leaf?
a. hypocotyl b. cotyledon c. suspensor d. endosperm
Females who are "carriers" for hemophilia
a. Theoretically pass the allele for hemophilia to half of their offspring b. Theoretically pass the allele for hemophilia to half of their daughters who become at least "carriers" for this disorder c. All are correct d. Theoretically pass the allele for hemophilia to half of their sons who become hemophiliacs e. Usually do not show any symptoms of hemophilia
A characteristic that is common to cnidarians is:
A) a medusa stage in the life cycle. B) stinging cells. C) that they create coral reefs. D) a complete digestive tract. E) an osculum.