The atmosphere, it holds all air on earth and keeps life livable by protecting use from the suns rays. The answer is atmosphere. :)
The correct answer is option d, that is, leak channels.
The cell membrane comprises protein channels known as leak channels, which permits sodium and potassium ions to leak down their concentration gradients. The membranes of the cell are significantly more permeable to potassium ions in comparison to the sodium ions, due to the presence of more K+ leak channels than Na+ leaks channels.
Answer:
D Point W
Explanation:
The best soil composition for lining a landfill is forty percent sand, forty percent silt and twenty percent clay. To fertile the land soil plays an important role in the growth of vegetables and fruits. Point W has the best soil composition and therefore it should be chosen.
Because everything is made up of cells
Answer: helper T cell.
Explanation:
This is a type of T cell that provides help to other cells in the immune response by recognizing foreign antigens and secreting substances called cytokines that activate T and B cells. T-helper cells fall into two main classes: those that activate other T cells to achieve cellular inflammatory responses; and those that drive B cells to produce antibodies in the humoral immune response. These two classes of response are generally incompatible with one another and require coordination by substances called cytokines to promote one response while dampening the other.
T-helper cells have CD4 markers on their surface. They are a special subpopulation of CD4 cells. They are also called helper cells and helper T cells.
