The human heart has only 4 chambers. Left and right atria and left and right ventricles.
Answer:
The squirrel, robin, and field mouse
Explanation:
A producer is what gets its energy directly from the sun (usually a plant) and the squirrel, robin, and field mouse all eat the plant seeds, which get energy from the sun .
Answer:
They have a closed circulatory system.
Explanation:
In an open circulatory system, blood vessels transport all fluids into a cavity. When the animal moves, the blood inside the cavity moves freely around the body in all directions.
Closed circulatory systems are different to open circulatory systems because blood never leaves the blood vessels. Instead, it is transferred from one blood vessel to another continuously without entering a cavity.
The answer will be to: produce protein