Answer:
Approximately 4.6 billion years ago, the solar system was a cloud of dust and gas known as a solar nebula. Gravity collapsed the material in on itself as it began to spin, forming the sun in the center of the nebula. With the rise of the sun, the remaining material began to clump up.
Explanation:
Use the punnett square to help you. girls are xx boys are xy. they get 50 from mother and 50 from father
The correct option is A. DNA contains genetic codes that code for proteins, which are essential and necessary for the growth and functioning of an organism.
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DNA replication needs to occur because existing cells divide to produce new cells. ... So the DNA needs to be copied before cell division so that each new cell receives a full set of instructions!
