Natural Selection, Charles Darwin coined the term “survival of the fittest”
Deletion- the fact that a codon is missing implies that the nucleotides were deleted.
There is external and internal so I'll list th external. The most important is skin then mucus, sweat or secretion, hair, nails and tears which are all part of the integumentary. Some internal defenses are white blood cells and T cells.
Answer:
A. intrusive igneous rock
Explanation: