I believe the answer is C
Answer:
The study that involves the research over earth atmosphere and climate changes in the past is known as the paleoclimatology. The study mainly concentrate over the past climates of Earth and atmospheric changes that took place in the past centuries. Studying fossils.
Explanation:
Flatworm get most of their oxygen through diffusion.
It has two phosppholipid layers that are either hydrophobic and hydrophillic the function is to protect thing from coming in and out
