Which of the following does not influence the strength of a stimulus?
1.frequency of action potentials
2.how many axons are responding
3.size of the action potentials
4.which axons are responding
3
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While we can use molecular clocks based on molecular sequence data to estimate the times at which various lineages diverged, we ultimately need the ____ to calibrate the clocks
Fill in the blank with the appropriate word.
Members of the Euglenozoa move within their habitats with the aid of
A. tests. B. pseudopodia. C. cilia. D. flagella. E. pellicles.
How would you best explain the existence of a mountain range that has abundant conifer trees, ferns, and mosses on the east side, but only sparse shrubby plants on the west side?
A. Differences in solar intensity produce the differing plant communities. B. Adiabatic cooling leads to temperature gradients that produce the differing plant communities. C. Differences in the specific heat of the two sides of the mountain produce the differing plant communities. D. Precipitation differences due to a rain shadow on the west side produce the differing plant communities.
What is the most likely role of the tests in a testate amoeba?
A. Provide motility B. Concentrate nutrients C. Enable adherence to surfaces D. Provide protection