Why is the sequence of dna important?
a.
it is used to create copies of cells.
b.
it makes sure there will be no mistakes in the information.
c.
it determines protein structure.
d.
it is needed to build new kinds of organisms.

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).

brain development. a child's brain undergoes an amazing period of development from birth to three—producing more than a million neural connections each second. the development of the brain is influenced by many factors, including a child's relationships, experiences and environment.

explanation: