There is strong evidence that two species of cliff-dwelling birds have nested in the same environment and fed in the same water for thousands of years, with each having stable population sizes. Based on this information, which of the following statements is the best conclusion?(A) One species is a better diver than the other species is. (B) The two birds compete for food. (C) One species will displace the other. (D) The two birds have different ecological niches that allow coexistence.
(A) One species is a better diver than the other species is.
(B) The two birds compete for food.
(C) One species will displace the other.
(D) The two birds have different ecological niches that allow coexistence.
Answer: (D) The two birds have different ecological niches that allow coexistence.
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Fifteen different strains of bacteria are auxotrophic for maltose and their mutations do not complement each other. The mutations in these bacteria map to the same DNA region using transformation of random fragments of genomic DNA. Only two different enzymes participate in the maltose biosynthetic pathway, and the genes for both are within a single operon. What does this data suggest?
A) There are fifteen enzymes in maltose metabolism. B) All the strains have mutations that prevent transcription of the operon. C) Fifteen genes encode maltose biosynthesis enzymes, but only two genes are crucial. D) Maltose is the preferred sugar source for the mutant bacteria.
Women with polycystic ovarian syndrome have difficulty conceiving because ____
a. they don't produce enough oocytes b. the oocytes they produced cannot mature c. they ovulate infrequently d. the uterus is filled with mucus that impedes implantation e. the oviducts are scarred
Which scientist specializes in categorizing and describing groups of organisms?
A) botanist B) entomologist C) herpetologist D) systematist
Large antlers in male elk, which are used for battles between males, are a good example of a trait favored by
A) intersexual selection. B) intrasexual selection. C) disruptive selection. D) stabilizing selection.