What structure separates the left atrium from the left ventricle?

Groups of organisms with low biotic potential, such as gray whales, that produce at most one offspring every other year a) are r-selected b) are k-selected c) are not subject to density-dependent limiting factors d) show the initial stages of the extinction process e) have escaped from the processes of natural selection and adaptation

Name 3 injuries and two diseases that affect the skeletal system.

What is the difference in the cell cycle between healthy cells and cancerous cells?