The wild carrot sprigs that starlings add to their nests
function
a. as a form of camouflage against predators.
b. as a form of insulation.
c. to repel parasites.
d. to prevent other birds from using the nest.
e. in ways that are currently unknown.
Answer: c
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According to Fig. 9.6, what is a key difference between cell signaling mediated by a surface receptor, compared to that mediated by an intracellular receptor?
A. Cell-surface receptors bind to specific signaling molecules; intracellular receptors bind any signaling molecule. B. Cell-surface receptors typically bind to smaller signaling molecules than those bound by intracellular receptors. C. Cell-surface receptors bind polar signaling molecules; intracellular receptors bind nonpolar signaling molecules. D. Signaling molecules that bind to cellsurface receptors lead to cellular responses restricted to the cytoplasm; signaling molecules that bind to intracellular receptors lead to cellular responses restricted to the nucleus. E. None of these statements about cell signaling differences is correct.
Which group of organisms will break down the wastes and remains within the community and convert them into inorganic building blocks?
a. Decomposers b. Secondary producers c. Primary consumers d. Detritivores e. Primary producers
Which of the following statements about the skeleton of a clam is NOT true?
A. The skeleton of a clam has two separate shells. B. The skeleton of a clam has muscles attached to it from the inside of the body. C. The skeleton of a clam is made of calcium carbonate. D. The skeleton of a clam is used mainly to allow movement of the organism. E. The skeleton of a clam grows with the organism.
Pest resistant cotton plants that produce Bt were produced by selective breeding
Indicate whether the statement is true or false