The heart has four chambers and four valves that regulate blood flow.
Anatomy:
Left and right atria
Left and right ventries
Mitral valve
Tricuspid valve
Aortic valve
Pulmonary valve
Please add answer choices but <span>Migration and hibernation are examples of behavioral adaptations
used by animals in the Arctic tundra.</span>
Cell is the smallest unit of an organism that can have a separate existence.
<h3>What is a cell?</h3>
This question is incomplete but I will try to help you as much as possible. The term cell is the smallest unit of an organism that can have a separate existence.
We know that all cells come from pre existing cells and complex multi-cellular organisms evolved from simple unicellular organisms. This forms the basis of the cell theory.
Learn more about cells: brainly.com/question/5763151
A force is a push or a pull. When one object pushes or pulls another object, you say that the first object is exerting a force on the second object.
