How does the nervous system affect the excretory system? A the kidneys are controlled by signals from the brain
B the excretory system removes waste from nerve cell
C action potentials remove waste from blood
D nerves connect the kidneys to the bladder

d.

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genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

her next move would be to use agarose gel electrophoresis to separate the dna molecules of varying length and create a dna fingerprint.

answer///(c) the maximum number of organisms an environment can support for a long time; i believe this is correct, plz check luck;