Which type of blood vessel carries blood away from the heart

Where can dna be found in a prokaryotic cell

Look at the photo of the leaf, which term best describes this leaf ? a-simple. b-parallel. c-lobed. d-tooth.

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.