The correct answer is A: cell
I think it's hydrothermal vents? hope its right because I have short term memory loss.
<h2>The answer is </h2>
False
<h2>Explanation:</h2>
According to Sigmund Freud human consciousness have been divided into three levels of awareness: the conscious, precociousness, and unconscious. These stages are never understood by any person at the same time. There is always a transition period between these segments. For example the transition stage from wake to sleep where we see a gradual reduction in consciousness with fuzzy, halfway states in between conscious and unconscious.
Answer: Possession of Valves
Explanation: Veins possess valves which ensures that blood flows in only one direction. Valves helps blood to flow back to the heart against gravitational force.
Arteries don't have valves because the pressure originating from the heart is capable of causing the blood to flow in one direction.
