A fern dies and is buried beneath many layers of mud, sand, and/or soil. Many years pass, and the mud, sand, and/or soil harden and turn to rock. Years of erosion erode the top layers of rock away. Eventually, the fossil, which is in the same shape as the fern, appears on the top.
A. Amber
B. Mold
C. Cast
D. Imprint
E. Petrified

"griffith's experiment discovering the "transforming principle" in pneumococcus bacteria. griffith's experiment, reported in 1928 by frederick griffith, was the first experiment suggesting that bacteria are capable of transferring genetic information through a process known as transformation." - griffith's experiment.

coal is not sustainable because it will one day run out.

it would affect precipitation by causing flooding in some areas of the world due to climate increasing, causing the glaciers in the northern and southern pole of our planet to melt.

i wish you would have provided choices to simplify it and allow me to give an exact answer.