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
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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
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
Which type of neuron is found only in the brain and spinal cord?
A) motor neuron B) sensory neuron C) interneuron D) glial cell
Neutrophils can kill bacteria by nonphagocytic mechanisms.
Answer the following statement true (T) or false (F)