Answer:
cells
Explanation:
Stomata are cell structures in the epidermis of tree leaves and needles that are involved in the exchange of carbon dioxide and water between plants and the atmosphere.
A) The medical information
Since 1913, the medical knowledge has vastly changed. Medical terms that are today common-knowledge (DNA, chemotherapy, etc.) were not even in existence in 1913.
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Answer: B
Explanation: Because in the passage it gives you a very detailed description about what happen and whats the author talking about but if i'm incorrect then its C