Question

your body is a complex and organized system. it is made up of many smaller and simpler systems, including cells.
humans are multicellular, or made up of more than one cell. in fact, an adult human body has about 37 billion cells.
like other multicellular organisms, a human starts as a single cell. that first cell grows and then divides to form more cells.
as a human body grows, it develops many types of specialized cells. specialized cells have specific functions as well as specific structures that help carry out those functions. different types of cells in the human body include skin cells, muscle cells, and blood cells. together, all types of cells carry out the functions that the body needs to survive.
select the correct answer.
a. as multicellular organisms grow into adults, they become larger and more complex. they develop many types of specialized cells, which have different structures and functions.
b. as multicellular organisms grow into adults, they become small and more complex. they develop many types of specialized cells, which have the same structures and functions.
c. as multicellular organisms grow into adults, they become larger and less complex. they develop many types of specialized cells, which have the same structures and functions.
d. as multicellular organisms grow into adults, they become smaller and less complex. they develop many types of specialized cells, which have different structures and functions.

Explanation:

The text states that as a human body grows, it develops many types of specialized cells. Specialized cells have specific functions and different structures. Multicellular organisms (like humans) become larger and more complex as they grow into adults.

• Option a: Correctly states that multicellular organisms become larger and more complex and that specialized cells have different structures and functions.
• Option b: Incorrect as it says cells have the same structures and functions.
• Option c: Incorrect as it says organisms become less complex.
• Option d: Incorrect as it says organisms become smaller and less complex.

Answer:

A. As multicellular organisms grow into adults, they become larger and more complex. They develop many types of specialized cells, which have different structures and functions.