Radioisotopes tell scientists that earth is how old?
a. 65 million years
b. 500 million years
c. 4.5 billion years
d. 13.4 billion years

Ted and emily played a mixed doubles tennis match against jack and brenda. in the second match. ted and brenda played against jack and emily. which type of chemical reaction does the situation demonstrate?

According to the kinetic-molecular theory, what happens to a liquid when it is transferred from one container to another? the volume and the shape stay the same. the volume increases to fill the new container, but the shape stays the same. the volume stays the same, but the shape changes to fit the new container. the volume and the shape change to fill the new container.

Chlorophyll a had the molecular formula c55h72mgn4o5 how many atoms are in this molecule