Why did the removal of wolves affect the entire Yellowstone ecosystem? A. It changed the balance of many different interactions.
O B. The organisms in the ecosystem did not compete for resources.
C. Wolves were the only predators in the ecosystem.
D. The wolves were the only producers in the ecosystem.
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Name the following: (a) category of pathogen that causes diseases, like common cold and mumps. (b) the microorganism that requires a host to produce.

What best describes emerging scientific ideas

During crossing-over, a. genetic material is exchanged between nonsister chromatids, resulting in new combinations of alleles. b. nonsister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. c. one homologous chromosome of a tetrad is exchanged with another tetrad, resulting in new combinations of alleles. d. sister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. e. genetic material is exchanged between sister chromatids, resulting in new combinations of alleles.