Answer:
three
Explanation:
Perhaps you have three: childhood, adulthood, and old age. Or maybe four: infancy, childhood, adolescence, and adulthood. Developmentalists break the life span into nine stages as follows: Prenatal Development.
The “S” phase which is the phase of DNA synthesis
Answer:
I snatched this from someone else, so it isn't mine, but I hope it helps. They don't have a username so I cannot credit them.
Explanation:
DNA content is halved in both meiosis I and meiosis II. Ploidy level changes from diploid to haploid in meiosis I, and remains haploid in meiosis II.
During anaphase of both meiosis I and meiosis II, the DNA content (number of copies of chromosomes) in a cell is halved. However, the ploidy level changes only when the number of unique chromosome sets in the cell changes. This occurs only in meiosis I (where separation of homologous chromosomes decreases the ploidy level from 2n to n and produces daughter cells with a single chromosome set).
Mass extinctions. Dinosaurs is the most recent (?)
The somatic mutation is a type of point mutation, which occur in the somatic cells and cannot pass on from the generation to generations. The inherited mutation is type of mutation which have occurred in previous generations and passed on to the subsequent generations.
