Why is the oldest seafloor less than 180 million years when the oldest continental crust is about 4 billion years old?

How does the author's purpose in this passage differ from an author writing about her personal struggle living with asthma?

Fan egg cell containing the (n+1) number of chromosomes combines with a sperm cell containing the (n) number of chromosomes, what is the result of this union? a) all future somatic cells of the organism will contain the (2n + 1) number of chromosomes. b) all future somatic cells of the organism will contain the (2n - 1) number of chromosomes. c) only certain somatic cells of the organism will contain the (2n + 1) number of chromosomes. d) all future somatic cells of the organism will contain the normal diploid number of chromosomes.

Identify any four organelles that should be present in the eukaryotic organism and describe the function of each organelle