What type of communication coordinates actions within the cells? receptor

intercellular

chemical signal

intracellular
Plz help ASAP

nucleus

Explanation:

Chemical signal is the type of communication which coordinates actions between neighboring cells .

This ability originated in single cells organisms and was essential for the evolution of multicellular organisms because after a cell receives a message, it is transferred across the plasma  membrane and  changes  are brought about within the cell in response to this message.

you would expect a sound wave to speed up. - b)

prolly a beacuse the momentuem the car has increases while going down hill