People with heart problems often have trouble breathing.
why would this happen?
a. the pumping of the heart is tied to the respiratory system.
b. red blood cells are produced in the lungs.
c. the heart provides the lungs with oxygen.
d. the lungs are the organs that bring carbon dioxide into the body.

Which of the following is not a characteristic of carnosaurs? a. long narrow skulls b. strong forelimbs c. horn projecting from their skulls d. none of the above

The distribution of related animals and plants across the world

In the united states there are strict fishing seasons and limits, but not all countries enforce similar laws. in bangladesh there are few if any fishing restrictions. what might be the reason for less restrictions in smaller countries like bangladesh? a) the united states is the only country worried about overfishing. b) the united states wants to limit the supply of fish to increase the price. c) bangladesh and smaller countries have an unlimited supply of fish in their coastal waters. d) small countries, such as bangladesh, are practicing subsistence fishing, taking only the fish needed to survive.