Answer:
B. White Blood Cells
Explanation:
I missed the word <em>innate</em> for a sec there, but then I looked up whether stomach acid is part of the immune system at all and realized my mistake.
The <em>innate immune system</em> is the part of the immune system one is born with, and we're not born with white blood cells. Those build up over time as we are exposed to pathogens.
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Pyruvatic acids are formed in the glycolysis stage during celluar respiration
Answer:
Smoking, drinking and taking substances can cause an early pregnancy
Explanation:
Answer: c. light-dependent
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