A-When the immune system is functioning properly, it can fight off disease-causing organisms including bacteria, viruses, and parasites as well as cancer cells while safeguarding healthy tissue.
The top layer would be most likely to have closer similarities to the organisms found today. hope this helps.
Answer:
See details below
Explanation:
STEP 1:
We know already that the capacity to absorb oxygen of the body is not limited by the amount of oxygen available, but by the ability of hemoglobin to bind and transport O2 so Itamin O is useless. There is no an efficient way of extracting oxygen when we talk to GI tract but we know that is transport to our lungs without problems.
STEP 2:
It is required a dedicated O2 binding protein (hemoglobin) indicates that dissolved oxygen by itslef cannot attain the high concentration required. The use of some Vitamin O would make a difference in the amount of oxygen already present in the blood
.
The answer for this one is A
