On a small swampy island off of the coast of maine, mosquito larvae, which feed on algae, are eaten by atlantic salmon. in turn, the salmon are eaten by black bears. the black bears are
a) producers.
b) herbivores.
c) primary consumers.
d) tertiary consumers.

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.