Answer:
D. in the past few decades, carbon dioxide levels have been falling.
Answer:
Explanation:
Darwin's use of many different fields of study including geology, economics, and biology was incredibly important as it allowed him to make connections between them that ultimately led to ground breaking discovery. Such as animals that that migrated to different areas and were interconnected through their geological footprints that were left behind.
Something that isn't a major concern could be the wether because the whether usually does not effect his experimental concept. In this case his concept is testing the effects of peanut butter on short term memory
Answer:
Two layers of Lipids make up the cell membrane
Explanation:
The inner and outer phospholipid layers