In the image below, what kind of molecules does the label A represent? A.
Water molecules

B.
Nitrogen molecules

C.
Oxygen molecules

D.
Carbon dioxide molecules

oxygen molecules

Explanation:

The arrows in the photo itself gives you the hint as you know in the picture they showed an arrow in which the tree is releasing something and we know that trees release oxygen gas which will be afterwards absorbed by the amimals and human beings.

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that is wrong, its not thymus.