Which of the following trace fossils is actually fossilized excrement

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm

You find a fossil that you are sure shows evidence of bipedalism. you know this because which of the following anatomical traits is present? a. thighbones that angle in toward the knees b. a narrow pelvis c. opposable hallux d. posterior position of the foramen magnum

The changes that the students observed, rapid breathing and sweating, would be classified as a to a change in a system.