50%, don't know if you use pun nett squares but Google them, they simplify it so much.
R. r
r Rr. rr
r Rr. rr
Answer:The rock formations of eastern North America, Western Europe, and northwestern Africa were later found to have a common origin, and they overlapped in time with the presence of Gondwanaland. Together, these discoveries supported the existence of Pangea.When Rodinia broke up, it split into three pieces: the supercontinent of Proto-Laurasia, the supercontinent of Proto-Gondwana, and the smaller Congo craton. Proto-Laurasia and Proto-Gondwana were separated by the Proto-Tethys Ocean.
Don't take my full word on it, this is what i think
Explanation:
I think that it is the bone system please tell me if right
To have an overall positive or negative charge. (as opposed to neutral one)