Answer:
46 chromosomes are present in somatic cell
Decent from a common ancestor; natural selection.
Answer: <span>Almost every type of bacteria has become stronger and less responsive to antibiotic treatment when it is really needed.
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Answer:
during the Cambrian Period of the Paleozoic Era.
Explanation:
The Paleozoic is the earliest era (of three) of the Phanerozoic Eon and is composed of six geologic periods: the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian (in that order from earliest to the latest). Fish first appeared about 530 million years ago during the Cambrian explosion.
