*PLEASE HELP* Which of the following best describes the role of the nervous system?

A. responds to all internal and external stimuli

B. detects only stimuli from outside an organism

C. responds only to stimuli occurring inside an organism

D. detects internal and external stimuli at the cellular level

I think it is A! The nervous system reacts to all internal/external, such as hormones, touch, sound, disease, etc

there are 35 white marbles

step-by-step explanation:

y- yellow marbles

4y + 5 = 45

subtract 5 from both sides

4y = 40

divide for from both sides

y = 10

plug in 10 to get 40 yellow marbles then subtract by 5 to get 35 marbles

thus there are only 10 yellow marbles

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).