Question

your body is made up of over 30 trillion cells. but you didnt start out that way. all humans begin as a single cell! that first cell grows and divides to form more cells. a human begins as a single fertilized egg cell known as a zygote. a teenage human is made of trillions of cells. as the human body grows and develops, cells become specialized to do different jobs. these different types of cells are the building blocks of the organ systems that keep us alive. complete the paragraph. humans start out as. as humans develop, the number of cells in their body. cells specialize to perform jobs in the body.

Explanation:

The text clearly states that humans begin as a single cell (zygote). As they grow, the cell divides to form more cells (so the number increases). And it mentions cells become specialized to do different jobs.

Answer:

Humans start out as a single cell. As humans develop, the number of cells in their body increases. Cells specialize to perform different jobs in the body.