Explanation:
digestion begins in the mouth Where food is chewed into smaller pieces by the teeth the Tongue helps by moving these pieces around These pieces are covered by saliva Or spit saliva makes the food slippery so It's easier to swallow
C is correct. Green algae is a non-vascular plant, meaning it doesn’t posses any water conducting tissues or much structural complexity
Each kidney is held in place by connective tissue, called renal fascia, and is surrounded by a thick layer of adipose tissue, called perirenal fat, which helps to protect it. A tough, fibrous, connective tissue renal capsule closely envelopes each kidney and provides support for the soft tissue that is inside.
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Explanation:
under what circumstance does a negative cell presents An antigen to another negative cell
Answer:
B) Na+
Explanation: Na+ molecule is polar, oxygen and carbon dioxide are nonpolar molecules. The cell membrane is a <em>phospholipid bilayer</em> made up of lipid molecules with polar and nonpolar ends. Since it is a bilayer, two phospholipid layers are arranged, one on the other in such a way that one faces the back of the other. The non polar ends are away from outside and inside of the cell, while the polar ends faces towards all the molecules inside and outside the cell.
Since polar-polar molecules repel each other, Na+ can't pass through the cell membrane easily. So it uses the proteins attached the cell membrane inside and outside to transport such molecules by using energy in terms of ATP.
