4 is the answer; the cytotoxic t cell ain't with the bs.
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Photosynthesis helps plants grow and become stronger as the more sunlight hits them. It’s where plants get all there nutrients aka food from to keep living.
<span>NA contains only elements, so it does not react easily. Many organisms do not contain DNA. Certain mutations in DNA happen at a constant rate. DNA does not change over time, making it a valuable clue.</span>
Trophic cascades are powerful indirect interactions that can control entire ecosystems
