They always show evolutionary relationships of organisms.
I believe gravity is the correct answer
The Paleozoic Era is bracketed by two major events in earth's history. It began with an unexplained explosion in animal life and ended with the world's largest mass-extinction known to man. The causes of these great events are currently unknown and under debate.
Answer:
12 - 3= 9 and -5i+4i=1i !!
Explanation:
did the quiz
