We start with 400 atoms of uranium-238. how many remain after 4.5 billion
after 9 billion years?
after 13.5 billion years?

Whats one way that rocks do not follow the typical rock cycle pathway?

In this assignment, you will analyze an example of speciation by researching the finches of the galapagos islands. then you will answer questions to construct explanations and draw conclusions based on the information you gather. someone plz !

Why zebra fish experience similar genetic disease as human