2: carbon can be found in the atmosphere, rocks, soil, & fossil fuels,
Waxes (option a) is correct
Answer: Retinalogical
Explanation:
Vitamin A is a fat soluble vitamin that can be stored in the body.It belongs to the group of unsaturated organic compound which has nutritional qualities in them. Vitamin A includes retinol, retinal and retinoic acid and few provitamin A.
It has multiple functions in the body. It is very essential for eyes. It acts as the growth factor for the epithelial cells and other cells in the body.
It is also required for a good immune system inside the body.
Hence, retina logical is not an active form of Vitamin A.
D. Hardness.
A measure of hardness is the property that a material scratches or be scratched.
The principle is that a harder material will scratch a softer one.
