In the fossil record, where would you find fossils of the oldest life forms? A
middle levels of the fossil record

B
lowest level of the fossil record
C
top level of the fossil record
D
all levels of the fossil record

May someone explain how to do this question?

Which two particles are found in the center of an atom

Balloon a has charge q, and identical mass balloon b has charge 10q. you hang them from threads near each other. choose all of the statements with which you agree. check all that apply. a. a and b exert the same magnitude forces on each other. b. the force that a exerts on b is 10 times the force that b exerts on a. c. the angle between the thread supporting a and the vertical is < the angle between the thread supporting b and the vertical. d. the force that a exerts on b is 1/10 the force that b exerts on a.