I think the answer is C. Hydrogen *not completely sure tho
The beginning of the Cambrian Period is marked by the evolution of hard body parts such as calcium carbonate shells. ... These body parts fossilize more easily than soft tissues, and thus the fossil record becomes much more complete after their appearance.
Answer:
Hi there! Hopefully this helps!
Explanation:
Answer: C.
Mitochondria are known as the powerhouses of the cell. They are organelles that act like a digestive system which takes in nutrients, breaks them down, and creates energy rich molecules for the cell. In cellular respiration sugar with the help of oxygen is broken down into ATP (energy molecule).
It is the abdominal cavity that contains the digestive organs.
Windward and Leenward sand dune
