<span>Erosion by rivers is a main valley-forming
process; other processes, such as movement of the earth's crust and
glaciers, also have an important part in some cases. The rate at which a
river deepens its valley depends on several factors.</span>
Answer:
Both have the electrostatic force of attraction which makes the bonds stronger.
Explanation:
They connect one atom to another.
Learned behavior
This is because instinct drives them to eat and find food, but they have to learn that a certain feeder is always out and available
