Hello!
Social interactions may help lower the risk of Alzheimer's disease by the brain constantly working behind the scenes.
So like when, a person is socially interacting, they are using their mind even if they don't notice. Someone in the beginning stages of Alzheimer's will not remember a lot of details about their lives. However, socially interacting may be able to bring back memories that will trigger the brain to remember the details they had forgotten.
So ''by helping keep a person's mind active'' is the correct answer.
Toodles~
The cell will gain water because there is 35% outside, and only 25% is inside. So, the arrow will be drawn as water going into the cell. The cell will gain mass because the cell will gain water. It's a hypotonic situation because the cell is gaining water.
The right answer is B.
*Hydrogen is the most abundant element representing nearly three quarters of the mass of the universe.
*Hydrogen is found in the water that covers 70% of the surface of our planet as well as in all organic matter.
*Hydrogen is the simplest element in the universe. It is composed only of one proton (p) and only one electron (e-).
*Hydrogen is the lightest element of all elements and gases; it is 14 times lighter than air. A "spill" of hydrogen gas immediately diffuses into the air and pollutes neither the ground nor the water table.
*Hydrogen is invisible, odorless and nontoxic. It does not cause acid rain, does not deplete the ozone layer and does not generate dangerous emissions.
Carbon number 1 is linked to the nitrogenous base (adenine, cytosine, guanine, or thymine).
Carbon number 3 is linked to the next nucleotide by a phosphate group.
Carbon number 5 is linked to the previous nucleotide by a phosphate group.
(The "next" or "previous" nucleotide depend on the direction your seeing it. I considered the 5'->3' direction.)
All the other carbons do not link to any other DNA component.