Which of the following was likely present in earth's early atmosphere over four billion years ago?

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

What is the period of cell life when it is conducting

What is the membrane that sheath of schwann cell containing cytoplasm and nucleus that encloses myelin