Is it true that the breakup of Pangea caused climate changes that caused organisms to adapt or die off, this occured during the Paleozoic era.

it's c. (to reduce the greenhouse effect/carbon gasses)

several tissues working together form an organ, and several organs together make up an organisms.

the group of cell that carries out special jobs are tissue.

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