Please help me ill mark u as brainlest

I think 23 represents the atomic mass, I am not sure. Please give me brainlist if the answer is correct.

Explanation:

I believe that is the mass number which represents the number of protons and neutrons.

coal is not sustainable because it will one day run out.

if the hares very faster than they are now, and thus the lynx's hunting success rate drops because it will be harder to catch them, the rate that will change will be the pray-rate. the pray-rate will change because more hares will be able to survive, thus more individuals for reproduction, so the end result will be increasing population of hares.

the predator-rate will remain pretty much the same because there will be more than enough pray, but the hunting success rate is stagnant.