Which of the following does not represent a compound?

NaCl
N20
CO2
O2

D. O2

Explanation:

First, let’s define a compound.

A compound is a substance made when 2 or more elements are chemically combined in a fixed ratio.

Now, let’s examine the answer choices.

A. NaCl

• This has sodium (Na) and chlorine (Cl) so it is a compound.

B. N2O

• This has nitrogen (N) and oxygen (O). This is a compound.

C. CO2

• This has carbon (C) and oxygen (O) so this is also a compound.

D. O2

• This only has oxygen (O). A compound needs two or more elements, so this is not a compound.

Therefore, the correct answer is D. O2

they all get energy from eating other animals, dead animals to be more precise.

hienas tends to steal pray from other animals. crows and vultures tend to eat dead animals and leftovers.

hope it ,

bioteacher101