Will give brainliest Which of the following is an environmental indicator of acid deposition?

Increased photosynthesis from the breakdown of leaves
Increased pH levels in lakes, rivers, or other bodies of water
Depletion of nutrients in soil that affect vegetation and crops
Decreased concentrations of toxic metals, such as aluminum in soil

the electromagnetic spectrum includes, from longest wavelength to shortest: radio waves, microwaves, infrared, optical, ultraviolet, x-rays, and gamma-rays.

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

read more on -

idk im sorry.