14. Dermis
15. Chemical
17. Virus
18. Antibodies
19. Gas exchange
20. Ligament
Hope this helps!
A is the answer. It’s like addition.
Answer:
carbon based molecules + oxygen = water + carbon dioxide
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Explanation:
(X3+8)+( 2X2+ 4X)
(X+2)(X2-2X +4) + 2X(X+2)
(X+2)(X2-2X+4+2X)
(X+2)( X2+4)
The second one due to the fact that pioneer plants come in much later
