Mass extinctions are periods during which a large number of species on earth become extinct over a short period of time. Which of the following typically follows mass extinctions?
a) natural selection can no longer occur
b) species' size is reduced
c) unusually rapid adaptive radiation and diversification of species
d) a sharp increase in background extinctions
e) the rate at which species can adapt to changing environmental conditions slows down
Ans: c) unusually rapid adaptive radiation and diversification of species
You might also like to view...
Why is it important that ectomycorrhizal fungi (EMF) have peptidase enzymes?
A) These enzymes are necessary to break through the tough lignin layers in plants. B) These enzymes assist with the breakdown of cellulose. C) These enzymes are needed to release nitrogen from dead plant material in colder environments. D) These enzymes catalyze the formation of the compounds used during decomposition.
The nucleus of an atom is composed of
A. protons. B. neutrons. C. electrons. D. protons and neutrons. E. protons and electrons.
Which item, A, B, C, D, or E, is a contractile vacuole?
1.A
2.B
3.C
4.D
5.E
Stem cells can be found in ____
a. nerve tissue b. all adult tissue c. muscle d. epidermis e. umbilical cord blood