Question: Which of the following is true? (choose all that apply) Question options: The earliest anima…

The earliest animals had a closed circulatory system.

The closed circulatory system includes a heart, arteries, and
veins.

The heart in fish pumps blood to the gills and then directly to
the tissues and then back to the heart.

The heart in mammals pumps blood to the lungs and then directly
to the tissues and then back to the heart.

Amphibians have a three-chambered heart.

Cephalopods have three hearts.

Both birds and mammals have a four-chambered heart.