Ethylene gas is known to cause fruit to ripen. As the fruit ripens, it produces elevated amounts of ethylene. This process is an example of

Ethylene is a gas and is known as the “fruit-ripening hormone.”

Explanation:

Every fruit has a certain level of ethylene production throughout its lifecycle. However, in some fruits, ethylene levels shoot up when the fruit starts ripening. These fruits can also respond to external ethylene by increasing their ripening rate.

postitive feedback becasue the response increases the orgazim's metabolic functions

Explanation:

i just did the flvs test so

rain is the best answer

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.