The valves in the heart open and close to move blood in between heart chambers. O a) three directions O b) two directions O c) four directions d) one direction

2. given that most biochemical (other than coal) rocks react with hydrochloric acid, what does that tell you about organisms?

Food contains a sugar called ( ), which is broken down in a process called cellular ( ). this process uses ( ) to break down food molecules and provide energy for cells. fill in the parentheses

When listening the levels of orginization in orginisims from the smallest to most complex , which level is just below organs in complexity