1. Three (3) Phylums
2. Nine (9) Classes
3. The Class has more groups.
4. The Phyla contains more organisms.
Caleb’s immune system will have the experience of getting rid of this antigen and know exactly what to do to overcome it efficiently.
Chlonoryst. It's the first choice
Answer: Natural selection is a process by which species of animals and plants that are best adapted to their environment survive and reproduce, while those that are less well adapted die out.
Explanation: