What would be a negative impact on the environment from a large scale mining effort in the ocean?
a. removing the minerals would directly cause underwater earthquakes.
b. the habitats of many marine animals would be disrupted.
c. the money used for water cleanup would be diverted to other things, causing lowered water quality.
d. too much equipment would need to be transported across the water, damaging the sea floor.

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.