Answer:
Vitamin D3 is synthesized in keratinocytes of the two epidarmal layers namely <u>stratum basale </u>(bottom layer) and <u>stratum spinosum</u>.
Explanation:
In the two epidermal layers of the skin namely <u>stratum basale</u> and <u>stratum spinosum</u>, 7-dehydrocholesterol (pro-vitamin D3) is converted to vitamin D3. This process takes place in the presence of ultravoilet radiations. Briefly, upon exposure, the pro-vitamin D3 is photolyzed to pre-vitamin D3. The pre-vitamin D3 then isomerized to form vitamin D3.
The Immune system and Endocrine system work
together to remove these wastes from their cells.
Answer:
Neither A nor B is correct
Explanation:
Hydrologic cycle is the sequence of different conditions through which the water passes from oceans to clouds, precipitates as rains, comes to the rivers and finally reaches the ocean.
This first statement in the question said that water will end up in the river which is not true because water from the river ultimately ends in the oceans because all the rivers terminate in the oceans finally.
The second statement is also wrong because when water from one ocean vaporizes and becomes cloud, it can travel large distances as clouds in the effect of wind and thus may get precipitated in the form of rain in some other part of the world. So, it is not necessary that the water will end up in the same ocean.
I think option c is right that is <span>The introduction of a new gene that can bind with the abnormal gene to inhibit its action.
Hope it helps .</span>