Answer:
B. Fossil
Explanation:
According to National Geographic, "Fossils are the preserved remains, or traces of remains, of ancient organisms." When you find the impression of a leaf, the leaf imprint is the preserved remains of the leaf.
The smallest thing they study is cells, i think!
hoped this helped!!
Answer:
there is an abundance of fertile soil
climate and fertile soil are crucial for plant growth
The increased temperature melts glaciers, ice caps etc. and thus increases the sea levels
