B is the right answer:
A more biodiverse ecosystem has a higher chance of adapting to species changes.
When two parents are purebred it means that they are homozygous for the characteristic that's being tested (in this case the fur colour). When they are crossed, the offspring will obligatory be heterozygous, an allele of each type from its parents. So, the trait that comes up will be the dominant trait, while the recessive trait will be hidden.
D. The cytoplasm slides and forms a pseudopodium in front to move the cell forwards.
