Although ferns and conifers maintained their diversity into the early Cenozoic era, ____ may have hastened their

decline in the early Cretaceous.



a. cycads
b. gymnosperms
c. angiosperms
d. invertebrates
e. mammals


ANSWER: c

Biology & Microbiology

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When phytochromes mediate plant responses to shading they could cause:

A. leaves to fall off B. leaves to turn towards the light C. no influence on leaves D. extension of shade leaves into the light E. leaves to turn brown

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The point at which the rate that a deleterious allele is being eliminated from a population by natural selection is in equilibrium with the rate at which the deleterious allele is being replaced by a new mutation is termed ________

A) mutation-dependent selection B) frequency-dependent selection C) mutation-dependent equilibrium D) mutation-selection balance

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Which type of neuron is found only in the brain and spinal cord?

A) motor neuron B) sensory neuron C) interneuron D) glial cell

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Neutrophils can kill bacteria by nonphagocytic mechanisms.

Answer the following statement true (T) or false (F)

Biology & Microbiology