Which statement correctly describes a chemical reaction? reactants come out of a reaction. energy is always released. bonds between atoms break and new bonds form. products go into a reaction.

i think the answer is gold im not entirely sure

after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

hope its .

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.

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).