#Question id: 5027
#Unit 11. Evolution and Behavior
Fossil evidence indicates that the following events occurred in what sequence, from earliest to most recent?
1. Protostomes invade terrestrial environments.
2. Cambrian explosion occurs.
3. Deuterostomes invade terrestrial environments.
4. Vertebrates become top predators in the seas.
#Question id: 11543
#Unit 7. System Physiology – Animal
Hormone X activates the cAMP second messenger system in its target cells. The greatest response by a target cell would come from ________.
#Question id: 9178
#Unit 9. Diversity of Life Forms
A fish swimming into an estuary from a river would have which of the following as its greatest physiological challenge?
#Question id: 3273
#Unit 11. Evolution and Behavior
The number of forward mutations is equal to the number of reverse mutations then
a) Population is in equilibrium for forward and reverse mutation rates
b) The population is being in Hardy–Weinberg equilibrium
c) No further change in allelic frequency
#Question id: 5762
#Unit 8. Inheritance Biology
An individual cell homozygous for a mutant allele of the gene for a human enzyme contains no detectable activity for that enzyme. The mutation is best described as