The UV is needed by the skin to make previtamin D3. Previtamin D3 or cholecalciferol made from the skin will be changed in the liver into 25- hydroxyvitamin D3 and then sent to the kidney to be changed into 1,25- dihydroxyvitamin D3. The last change in the kidney will active the vitamin D. Vitamin D has a role in the calcium absorption which was will strengthen the bone tissue.
Answer:
Commensalism.
Explanation:
Commensalism is a symbiotic relationship that exist between organisms in which one organisms benefit from the relationship and the other neither benefit of is harmed. From the question the algae benefits by getting accommodation and nutrients from the floating plants but the floating plants neither benefit or is harmed.
I think is the hypothalamus- pituitary-adrenal.
Well if you have any plants on your home identify them and see what they do.
Alo vera is good to keep in your room, it helps with the air your room and helps you sleep.
Think what do plants do? They filter and let off oxygen correct?
It would be very difficult for use but if we had the plants in the ocean and plankton they would be able to do what trees flowers and other plants on land do.
If i am not mistaken ,
A
i ) 15 and 21
ii) 10 and 17
iii) 18
iv) 9
B . it plant cell