4. In order to stimulate an effector in a toe, which pathway does a nerve impulse follow after it is initiated at a receptor? A) interneuron ®sensory neuron ®motor neuron
B) interneuron ®motor neuron ®sensory neuron
C) sensory neuron ®motor neuron ®interneuron
D) sensory neuron ®interneuron ®motor neuron

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).

more words for this could be abiotic and biotic

abiotic: living organisms within an ecosystem

biotic: non-living organisms within an ecosystem