Which of the following is least likely to be a cause of extinction?
A. Asteroid impact
B. Human activity
C. Adaptive radiation
D. Continental drift
E. Climate change
Answer: C
You might also like to view...
Which excitatory neurotransmitter is responsible for muscle contraction in vertebrates?
A. dopamine B. norepinephrine C. nitrous oxide D. glutamate E. acetylcholine
Spherical resting cells produced by Sporocytophaga are called ________.
A. microcysts B. heterocysts C. oocysts D. nitrocysts
Which of the following is NOT a characteristic of most animals?
A. They have Hox genes. B. They are heterotrophic. C. They have an extracellular matrix of proteins such as collagen. D. They have cell walls. E. They have a nervous system.
What would be revealed in a comparison of mitosis and cytokinesis in animal cells and plant cells?
a. A cleavage furrow is initiated in animal cells, while a cell plate begins to form in plant cells during telophase. b. The nuclear envelope disintegrates in prophase in animal cells, but remains intact in plant cells. c. Sister chromatids are identical in animal cells, but they differ from one another in plants. d. In animal cells, chromosomes do not become attached to the spindle until anaphase, whereas chromosom