Ineed brief descriptions of each one on screen. these are ways cells communicate. 15 to 30 points.

Molecular signal

Many cell signals are carried by molecules that are released by one cell and move to make contact with another cell. Endocrine signals are called hormones. Hormones are produced by endocrine cells and they travel through the blood to reach all parts of the body.

Gap Junctions

Gap junctions are a specialized intercellular connection between a multitude of animal cell-types. They directly connect the cytoplasm of two cells, which allows various molecules, ions and electrical impulses to directly pass through a regulated gate between cells.

true is the answer : )

b. the carbon cycle ensures living things have a source of hydrogen