It should be transport of waste but I’m not 100% sure :(
Answer:
A) A single gene can only influence a single trait
Explanation:
One gene has the possibility of influencing many traits and in the same manner, multiple genes can affect a single trait.
Intradermal means pertaining within the skin.
It is definitely not a primary source: this would be a book itself.
Now, is it a tertiary source? I don't think so: the author of the review should have read the book and should only be referring to this book in the review.
I think it's a secondary source.
