So carbon dioxide can diffuse from the leaf
The theory is most likely A) Valid. If a group of authorized scientists agreed on the theory, it would be valid. It would most likely be unreliable if it was only one scientist working alone and biased. If you don't have a group of scientists, the theory most likely won't be true because it hasn't been tested many times.
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Only one strand will be transcribed and the other servers as a coding stand. ... Without it, the single strand DNA with exposed nitrogenous bases is very unstable so two strands actually stabilise the structure.
Answer:
D. Predator-prey!
Hope This Helps! And that I wasn't too late!