A. signaling cell b. ligand c. receptor d. responding cell in communication between cells, the produces the signaling molecule, also known as the ; the produces the to which the signaling molecule binds.

Answer      A, B, D, C

Explanation:

This process is known as cell signalling.

The interaction of the cells with their environment and other cells around them is cell signalling.

There are four basic categories in multicellular organisms, these are

* autocrine signalling

* endocrine signalling

* paracrine signalling

*signalling by direct contact.

first one is right answer