The correct answer would be completely by mitosis.
Mitosis is a type of cell division in which a parent cell divides into two daughter cells each with the same type and number of chromosomes as present in the parent cell.
Before cell division, the cell undergoes growth and replicates or doubles its genome.
The process of mitosis is usually divided into four phases prophase, metaphase, anaphase, and telophase.
It helps in the growth and repair of the cells or tissues in multi-cellular organisms.
The correct answer is initially by meiosis, then by mitosis
The answer is initially by meiosis and then by mitosis!
Hope this helps!
This question is confusing. What I can tell you though, is that mitosis is the process in which cells divide and cause the animal fetus to grow, but it is meiosis that ensures the animal can develop as a fetus initially. (The 4 resulting haploid cells form a sperm gamete and an egg gamete, and they come together to form a zygote, which eventually develops into a fetus)