Scientist study index fossils so they will get an understanding of what life was like back then.
Answer:
The main purpose of research is to inform action, to prove a theory, and contribute to developing knowledge in a field or study.
Explanation:
There are no answer choices, but I know the mitochondria create energy for the cell.
Answer: Four pulmonary veins.
Explanation: Oxygen and nutrient rich blood will flow from the lungs back into this part called the left atrium (Or as some will call it, the left upper chamber in the heart). From there, it goes through four pulmonary veins.
Hope I could help! :)
Well there's Water, Earth, Fire, and Air. Not quite sure how this would be a school question. But here it is.
