Enzymes act as catalysts in biochemical reactions. In the diagram, which represents a catalyst?
A) W
B) X
C) Y
D) WX

Asap! how does the distance between two objects affect the force of gravity? how is the moon dependent on the sun?

Use the drop down menus to match each example to the fossil topic discussed then to show how the fossil record gives evidence of evolution

Which factor most likely caused animals and plants in india to differ greatly from species in nearby southeast asia?