Pioneer species. They are the usually the first to grow after an ecosystem has been destroyed(in this case by flood).
When you drop a ball, it is dropped DOWNWARDS so the number is represented by a negative number. If you toss the ball up it will be a positive number.
To answer your question:
When an object is dropped downwards there will be a negative number since the object is falling downwards.
<span>The ventricular system consists of four ventricles that are interconnected in the brain.
The third ventricle</span> is the portion of the ventricular system is found within the diencephalon. It is a median cleft in the diencephalon between the two thalami, and is filled with cerebrospinal fluid (CSF).
The hypothalamus is the gland located within the floor of the this ventricle.
Drinking water shortages? Water across the world isn't purified which without purification doesn't quench thirst.
C.)<span>Place one hand under the base and grasp the arm with the other hand.</span>