____-producing neuroglial cells that associate with most vertebrate neurons speed conduction of action potentials
a. Sodium
b. Potassium
c. Neurotransmitter
d. Connective tissue
e. Myelin
e
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Recall that over the last 400,000 years, atmospheric CO2 levels have fluctuated, with the lowest levels occurring during glacial periods and the highest levels seen during interglacial periods
Why might atmospheric CO2 levels be lower during glacial periods? A. During glacial periods there are more volcanic eruptions. B. During glacial periods there are fewer photosynthesizing plants. C. During glacial periods more carbon is stored in ocean reservoirs. D. During glacial periods chemical weathering stops.
Prior to the Mesozoic Era, the primary photosynthesizers in the ocean were the cyanobacteria and the diatoms
A. true B. false
What is the function of a polar body?
a. it directs sperm to the urethra b. it provides nourishment to the developing oocyte c. it serves as a nurse cell to spermatids d. it may become a functional oocyte e. it has no function
The smallest particles occurring in soil are referred to as
A) clay. B) gravel. C) sand. D) silt.