It’s B the other person put D but that’s the cell wall or cell membrane
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One result of a loss of ground water would be that the freshwater on earth is 98 percent stored in the ground, therefore we would lose 98 percent of the very little amounts of freshwater we have
No.
The SR is ordinarily involved in intracellular (cytosolic) calcium *release*, not removal.
SERCA pumps help to control cytosolic calcium levels and calcium uptake, or lack thereof when inhibited e.g. by PLB (phospholamban). Proteins calsequestrin, Triadin, and Junctin work at the ryanodine receptors to help to modulate and control cytosolic calcium levels.
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Lipids
Lipids are fatty acids
