13. which bedrock feature is most useful in correlating sedimentary bedrock in one area with sedimentary…

13. which bedrock feature is most useful in correlating sedimentary bedrock in one area with sedimentary bedrock in another area? a. index fossils b. cementing agent c. texture d. color 14. the index fossils shown below are the remains of organisms that lived during which geologic era? a. precambrian b. paleozoic c. cenozoic d. mesozoic 15. which statement about the species of animals and plants that lived on earth in the past is best supported by the fossil record? a. most became extinct. b. most became extinct.

13. which bedrock feature is most useful in correlating sedimentary bedrock in one area with sedimentary bedrock in another area? a. index fossils b. cementing agent c. texture d. color 14. the index fossils shown below are the remains of organisms that lived during which geologic era? a. precambrian b. paleozoic c. cenozoic d. mesozoic 15. which statement about the species of animals and plants that lived on earth in the past is best supported by the fossil record? a. most became extinct. b. most became extinct.

Answer

Brief Explanations:

  1. Index fossils are distinctive fossils used to identify and correlate rock layers across different areas as they are from organisms that lived during a specific, short - time period. Cementing agent, texture, and color are not as reliable for correlation.
  2. Trilobites (one of the common index fossils shown) and brachiopods are typical Paleozoic era fossils. The Paleozoic era is known for a wide variety of invertebrate life forms.
  3. The fossil record shows that over geological time, most species that have existed on Earth have become extinct due to various factors like environmental changes, competition, and mass - extinction events.

Answer:

  1. A. Index fossils
  2. B. Paleozoic
  3. A. Most became extinct.