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Fossils must be a body part of the organism.

As laid out by Tuzo Wilson the Wilson (Tectonic) Cycle would end with which of the following?

All plate tectonic boundaries exhibit which of the following?

What function do thrombocytes have?

Select the order that best reflects how nerve impulses travel through the heart.

What is one function of blood?

Lymph flows through at least one lymph node before as it returns from peripheral limbs before re-entering the blood stream.

When blood is allowed to clot and the clotted blood is separated from the remaining fluid, what is the fluid called?

Select the order that best reflects how blood flows through the heart.

What organ gets smaller as an animal ages?