Which of the following provides the likeliest explanation for the differences seen in the human population?
A. presence of parasites in different areas
B. amount of sunlight in different areas
C. the altitude in different areas
D. natural selection
D
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Cheetahs are specialized hunters that stalk Thompson gazelles. This is an example of a ________ relationship.
A. commensalism B. mutualistic C. parasitic D. predator-prey
Cardiac muscle fibers are joined in a way that allows the cells to activate each other, and do not require stimulation by a neuron.
a. true b. false
Why do cells not have membrane transport proteins for O2?
What will be an ideal response?
Please choose the microbial control method that neither inhibits nor kills microbes, but instead physically removes them from liquids or air.
A) Cold sterilization B) Lyophilization C) Filtration D) Desiccation E) Irradiation