(1) do you enjoy being out in the fresh air? (2) does nature restore your spirits? (3) you might want to consider hiking as a hobby. (4) it's a hobby you can begin with very little expense. (5) all you need to start is a good pair of hiking shoes.

complete the sentence with the appropriate verb. how does the first sentence in the paragraph to the main idea?

a. explain
b. introduce
c. delay
d. specify

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.