How are the cells in one system different from cells in other systems?

Cells are the smallest functional units of life. Tissues are groups of similar cells that have a common function. An organ is a structure that is composed of at least two or more tissue types and performs a specific set of functions for the body. The body has levels of organization that build on each other. Cells make up tissues, tissues make up organs, and organs make up organ systems. The function of an organ system depends on the integrated activity of its organs. For instance, digestive system organs cooperate to process food.

Explanation:

The correct answer is a. Zygote

Explanation:

Edouard van Beneden was a zoology professor at the University of Liège whose worked showed how chromosomes are organized during gamete formation or during meiosis process.

During meiosis, the chromosomes number is reduced to half so each gamete contains half of the chromosome found in somatic cell and are called haploid cells. This reduction in chromosome number is necessary to bring the correct number of chromosomes in the zygote.

During fertilization, sperms fuse with eggs to produce a single diploid cell that is known as zygote. So the zygote has 46 chromosome in which half comes from sperm and half from the egg.