Answer:C. There will be an increase in variety of the shape of the B and T cell receptors allowing them to recognize and destroy more pathogens
Explanation: usa test prep
C. Common Ancestors are the animals that we evolved from
Answer:
potassium, phosphorus and zinc.
Explanation:
The very primitive organism is the oldest because, over time, organisms gradually evolved into more complex organisms. First came the primitive organism, then it evolved into the more complex one, or the younger fossil.
