What is a pure substance that is present before a reaction but not after.

i think it is d. e because the next one is igneous.

the atomic mass is the bottom number on the element.

-steel jelly

1 is the answer to this problem

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