What animal has the longest pregnancy​

Elephants have the longest gestation period of all mammals

Elephant has the longest pregnancy.

the way that the mass of carbon can be conserved through cellular respiration is through a process/law called the law of conservation of mass which even tho it undergoes a process, mass is not be destroyed or changed

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added