The main purpose is protection. The lipid bilayer protects the cell from viruses and other threats to the cell. It also maintains homeostasis within the cell by monitoring the amount of substances the enter or exit the cell.
Osama bin Laden declared war on the United States because he <span>saw the United States as an oppressive, occupying force that was evil and harmful to Islam. The correct option among all the options that are given in the question is the fourth option or option "D". I hope the answer has come to your great help.</span>
A sound wave is A wave of compression and rarefraction .
I believe the answer is B, primary active transport. Root hair cells in plant use active transport to absorb mineral ions such as nitrates from the soil. The concentrations of minerals in the soil are lower in the soil than in within the root hair cell, therefore the transport will be against the concentration gradient which does not favor diffusion, therefore the pant has to use active transport.
