Question

1. what are multicellular organisms made of?

many specialized cells working together
just one type of cell
repeating tissues with no function
a single organ system

Explanation:

Multicellular organisms are composed of many cells. These cells are specialized, meaning they have specific functions. Specialized cells work together to perform various tasks necessary for the organism's survival and proper functioning. For example, in a human (a multicellular organism), there are nerve cells (neurons) that transmit signals, muscle cells that enable movement, and blood cells that transport oxygen. Just one type of cell (like only muscle cells) cannot form a multicellular organism as multiple functions are required. Repeating tissues with no function is incorrect as tissues in multicellular organisms have specific functions (e.g., epithelial tissue protects the body). A single organ system (like only the digestive system) is not sufficient to make up a multicellular organism; multiple organ systems (digestive, circulatory, nervous etc.) work together.

Answer:

Many specialized cells working together