Do any of the proteins in your plasma come from food proteins

The distribution of related animals and plants across the world

How would you expect the mrna codons that code for the amino acids that make up hemoglobin to compare between humans

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.