Active transport requires energy when moving molecules against a concentration agent. It requires for specific membrane transport proteins. Only a certain type of protein can move a certain type of substance.
The three main types of Active Transport are:
1) Sodium-Potassium Pump
2) Endocytosis
<span>3) Exocytosis </span>
The weather man said the relative humidity will be high today
Answer:
C is the correct answer.
Explanation:
You can automatically eliminate B and D because they have little to do with the movement of the body. And it's not A because the skeletal system doesn't have the signals to tell the muscular system what to do.
The presence of limestone<span> and other calcium carbonate rock in </span>lakes<span> and streams helps to maintain a constant pH </span>because<span> the minerals react with the excess </span>acid<span>. However, </span>acid rain<span> eventually can overcome the buffering capacity of the surface water.
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Answer:
Primary role of vitamin D is to absorb calcium. It along with calcium, helps to keep bones strong. It also help to make the bone brittle.
Deficiency of vitamin D causes the bones to lose their strength. If body does not get enough vitamin D, then absorption of calcium is lost resulting in osteoporosis in adults and rickets children.
