The lining of the gastrovascular cavity in cnidarians will function in both ________
a. respiration and reproduction
b. urination and respiration
c. respiration and digestion
d. immunization and digestion
e. reproduction and digestion
c
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In mitosis, chromatids separate and move to the center of the cell during ____________________. What will be an ideal response?
What is an immune system cell that binds to an antigen?
A) antibody B) immunoglobulin C) T cell D) macrophage
Autoimmune diseases result from
a. overactive immune function. b. increase in self-tolerance. c. failure of the immune system to differentiate self and nonself molecules. d. communicable infections.
Consider the model for the equilibrium number of species in a mainland (continental) region, as illustrated in Figure 20.23. What does this model say about the rate of speciation?
A) The rate of speciation decreases as a linear function of the number of species. B) The rate of speciation increases as a linear function of the number of species. C) The rate of speciation increases as a function of the number of species, but the rate of increase decelerates as the number of species becomes large.