The cells of the immune system
Answer:
d adaptation
Explanation:
its an adaptation because its a change that helps the organism survive
Eight of them. If the last xero was not significant it should not be there
Answer:
7. Adenine (A), nitrogenous bases
8. cytosine
9. nucleotides
10. purine
11. double helix
12. genetic material
13. single-ring
14. double-ring
15. nucleic acids
16. chromosome
Hope this helps :)
P.S. plz ask if you need any clarification
