What type of division (meiosis or mitosis) does the diploid zygote of an animal have to go through (usually many times) in order to give rise to all of the cells in the adult body?

Mitosis

Explanation:

A zygote is a fertilized egg. This zygote needs continuous growth in order to develop into a grown adult. The growth involves generating new somatic or body cells through cell division. A parent cell in the zygote divides to produce identical copies of itself. This way, genetic information is passed on the the new arising daughter cells. To do this, the parent cell must first replicate its DNA and the process of separating this duplicated DNA into two identical cells is known as mitosis.

Mitosis is a type of cell division that involves the production of daughter cells that are genetically identical copies of the parent cell and also the same number of chromosomes as the parent cell.

As cells divide, duplication occurs. As cell multiplies, growth is occurring in the organism. The zygote keeps undergoing growth division (mitosis) till it gives rise to all the cells in an adult.

On the other hand, Meiosis is also a type of cell division but it is a division mainly involved in reproduction not growth. Reproductive cells divide to give rise to daughter cells (gametes) that have a reduced number of chromosomes.