The muscle cells of an elephant contain 62 chromosomes. How many chromosomes are in an elephant egg cell?

What type of lipids are found in all biological membranes?

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.

What is true of metabolism in its entirety in all organisms?