Answer:
Most animals obtain their nutrients by the consumption of other organisms. At the cellular level, the biological molecules necessary for animal function are amino acids, lipid molecules, nucleotides, and simple sugars. However, the food consumed consists of protein, fat, and complex carbohydrates.
Explanation:
Well to reabsorbed most of the water from the urine so that only small amount can be excreted. Desert animals need their water
All visual pigments contain retinal
derived from vitamin A
The zygote implants in the uterus
I think it’s option number three.
