Water is an abiotic factor in terrestrial environments. true

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

What problem would a person most likely have if her kidney did not work correctly?

Which of the following must be true for a fossil organism to be useful as an index fossil? a. the fossil organism must be widespread geographically. b. the fossil organism must be abundant. c. the fossil organism must be limited to a short span of geologic time. d. all of the above.