Photosynthesis and chemosynthesis
Answer
d.crust
Explanation
because he covered the layer of the earth
Answer:
A.........................
The answer is: "global" .
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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.
