The oldest type of bacteria is over 3 million years old I think. It comes from the cyanobacteria family! The bacteria is a type of algae! Discovered by Gregorio V. in the Late 1900's.
A. carbon dioxide levels above normal
Answer:
So we can get energy to perform our daily activities.
Explanation:
When we eat food it gives us chemical energy that we (humans) transfer into mechanical energy. That is why you need food.
Answer:
D. Fill the ventricles.
Explanation:
The medical definition is "an anatomical cavity or passage especially : a chamber of the heart that receives blood from the veins and forces it into a ventricle or ventricles."