Explain why mutualism is sometimes viewed as ‘reciprocal exploitation’. What will be an ideal response?
In a mutualism, both species benefit from their interaction with each other. But, each species is
seeking to gain more benefit or give up less in the interaction. Thus, there is a constant evolutionary
battle between the two of how little can be given and how much taken before the interaction fails.
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What is present in arterioles that is NOT present in capillaries?
A) white blood cells and platelets B) carbon dioxide C) a lining of endothelial cells D) circular smooth muscle cells
Human height shows a continuous variation from the very short to the very tall. Height is most likely controlled by
A. sex-linked genes. B. epistatic genes. C. mutations. D. multiple genes.
The dinosaurs (other than birds) went extinct during the asteroid impact at the K-P boundary because they were poorly adapted to their ecological niches.
a. true b. false
Cells of the second line of defense called ________ recognize and kill virus-infected cells
A) basophils B) eosinophils C) macrophages D) NK cells E) dendritic cells