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 a single cell . as humans develop, they form more cells. cells specialize to perform jobs in the body.

Explanation:

The text provided explains that humans begin as a single fertilized egg cell (zygote), which grows and divides to create more cells. These cells then specialize to carry out distinct roles in the body. The blanks are filled using key terms from the provided instructional content.

Answer:

Humans start out as a single cell (zygote/fertilized egg cell). As humans develop, they form more specialized/different types of cells. Cells specialize to perform different/specific jobs in the body.