Each species of yucca plant is pollinated exclusively by one species of yucca moth. This insect cannot complete its life cycle in any other plant, as its larvae can only grow in the yucca flower. Which of these terms BEST describes the relationship between the moth and the plant?
a. predation
b. mutualism
c. competition
d. commensalism

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.