Which of the following is an organic molecule
a) oxygen gas
b) sucrose
c) iron oxide
d) water

Option B - Sucrose

Explanation: Any compound containing carbon atoms covalently bound to other atoms is referred to as an ORGANIC COMPOUND or MOLECULE.

From the options provided, Oxygen gas (O2) does not have any carbon atom, so it is not an organic molecule; so also iron oxide (Fe2O3) and water (H2O).

Sucrose, however, with formula C12H22O11, consists of 12 carbon atoms bound to 22 hydrogen atoms, and 11 oxygen atoms.

So, Sucrose is the right answer.

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jk but i am serious about the part that most people cant answer it beacuse you did not mention the section you are talking about. but it would if you added some detail and were a bit more specific.

above statement is not a true statement about the open ocean because the open ocean has low levels of nutrients. most of the photosynthetic activity on earth occurs in the open ocean within the photic zone. organisms in the deep ocean are exposed to frigid temperatures and total darkness but it does not begin at the low-tide mark.