One of the most commonly used methods of analysing the age of a certain crust is through analysis of its isotropic composition, such as the presence of the elements of tellurium and selenium. However, by general principle, the continental crusts are considered to be much older than the oceanic crusts.
A nucleus. Prokaryotic cells don't contain this nor other specialized organelles.
Answer: I think the first answer would be the best option
Explanation:
A mutation is a permanent change in the order or bases in DNA
It allows for variation in the offspring
