What does comparing the weight if a mineral to an equal volume of water tell you? a. cleavage b. streak c. specific gravity d. non-specific gravity

Aboy jumps into a cold swimming pool and his body tempature goes down hus muscles ,blood vessels

Tides that occur during the new and full moons

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.