Which statement best describes a mole?
it is 12 units of a given substance.
it contains 6.02 mc001-1.jpg 1023 grams of sodium chloride.
it is the mass of 12 carbon atoms.
it contains 6.02 mc001-2.jpg 1023 particles of a given substance.

Answer : The correct option is, It contains particles of a given substance.

Explanation :

According to the mole concept, one mole of a substance contains number of particles of a given substance.

For example :

1 mole of oxygen (O) contains number of oxygen atoms

1 mole of oxygen contains number of oxygen atoms

Hence, the correct option is, It contains particles of a given substance.

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