HELP PLS N TY!!

theres 3 diff problems im just kinda lost

The similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between organisms in both locations?

What type of pollution does household garbage cause

Aragonite shells of clams, snails, or scleractinian corals may be preserved unaltered in cenozoic deposits, but they are generally dissolved or recrystallized in older deposits. true or false