Actively transport molecules across the cell membrane
Answer:
Index Fossils
Explanation:
Index fossils are used by scientists to help them figure out the dating of discovered fossils or the correlation. They are also very known to appear in a (very) certain/specific age range.
Hope this Helps!
34)4. 36)1 is what I think the answer could be. For my studies and quizzes I could feel like those answer are it.