B) Oxygen may not have been able to accumulate in the atmosphere
Answer: increased
Explanation: the more you have the better you can tell where something is acting on you, ie touch
Answer:
Cilia and flagella are projections from the cell. They are made up of microtubules , as shown in this cartoon and are covered by an extension of the plasma membrane. They are motile and designed either to move the cell itself or to move substances over or around the cell.
Explanation:
Mouth or nose. Then goes into your trachea and into your lungs