The two chambers at the top of the heart called atria, the two chambers on the bottom are ventricles. The tip of the bottom of the heart is the apex.
D neither a nor b is right
Either means he wants a secretive relationship or he wants to have sexual relations.
Answer:
Its harder to get rid of pest infestations in apartment buildings because the pests have a larger area to invade, repopulate, and hide from things like predators and exterminators. This makes the job of an exterminator especially difficult because they would have to sweep the whole building to get rid of the pests rather than one apartment.
