Long bones grow longer at the heads true false

The answer is false the long bones doesn’t grow longer in heads because Long bones typically have an elongated shaft and two expanded ends one on either side of the shaft. The shaft is known as diaphysis and the ends are called epiphyses. Normally the epiphyses are smooth and articular. The shaft has a central medullary cavity where lies the bone marrow. Long bones are usually divided into different three categories:

Typical long bones: They have a long shaft and two ends and are represented by bones such as humerus, femur, radius, ulna, tibia and fibula.  As the name describe, these bones have a small look and sometimes they have only one epiphysis.

the aswer is letter c

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).