Which features do the cells of a duck's foot, an alligator's tongue, and a human's eye have in common?

Ryan rears sheep for their wool. recently the quantity of wool that ryan gets has diminished. this is because the new sheep are not that wooly. ryan should add which nutrient to their feed so that the sheep becomes more wooly? a.cornb.ironc.cottonseedd. vitamin a

How many cells are our body made of ? ♡

Which identifies the main purpose of biological taxonomy?