Answer:
<u>ion channels</u>
Explanation:
The plasma membrane plays a critical role in regulating and maintaining ionic potential inside the cell, relative to ionic concentration present outside the cell. The ion channels are specific, in that they only recognize and allow particular ions to pass through and block the rest. Their opening and closing depends on the ionic potential during that time period.
The choices can be found elsewhere and as follows:
a. Increased temperature and pressure
b. Melting and crystallization
<span>c. Exposure and weathering </span>
<span>d. All of the above
</span>
I believe the correct answer is option C. It would be Exposure and weathering that would cause an igneous rock to become soil. <span>Weathering breaks rock down into small particles which are carried away by erosion and deposited somewhere, sometimes creating very verdant soils. </span>
<span>Most of the energy from photosynthesis flows out as heat is the statement not correct.</span>
