The diagram below shows atoms that are all arranged into groups in the same way.
What does this diagram represent?
A. a single type of element
B. three different substances
c. a single type of substance
D. two different substances

Use the drop down menus to match each example to the fossil topic discussed then to show how the fossil record gives evidence of evolution

Which best describes a benefit of using dna technology in medicine? a) medicine can be produced in mass quantities. b) medicine can be distributed at a reduced cost. c) medicines have fewer side effects. d) medicines are resistant to antibiotics.

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