To build a complete picture of the animals and plants that were living at a particular time in the past. ... In addition, the rock itself provides much useful information about the environment in which it and the fossils were formed.
Answer - A
Prokaryotic cells, being unicellular organisms, do not have a defined nucleus. They have a nucleoid in place of the nucleus which is formed of a single chromosome consisting of double stranded DNA.
For an offspring to dominate a recessive trait, both parents must have at least one dominant allele in their genotype.
