Seismic waves can be measured and recorded by devices called these devices record the seismic wave vibrations as jagged lines on paper. the stronger the vibrations, the more jagged the lines. these recordings are called

What organs comprise the respiratory system of a bird

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.

Which nutrient tends to cycle within a single ecosystem?