If you mean a specific system then the reproductive system...but i haven't the slightest idea as to anything else to do with your question...
Answer:
I think it's C: Water
Sorry if I'm wrong:(
Explanation:
I think it's water because it says abiotic feature and abiotic means non-living, although the water has living animals and bacteria in it, the water itself isn't living.
Answer:
oxygen
Explanation:
cells use to produce energy during cellular respiration
<span>Thymine Is 20% in the DNA molecule.
Hope this helps.
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_______________ reactions transfer energy to the surroundings, usually as heat.
C. Exothermic
