Nile River: The Nile River flows north because of
elevations.
*

The Nile flows north because north is downhill. Rivers flow "downhill" to sea level (generally speaking; some end in other bodies of water or join another river. The land falls away towards the north, thus the river flows north until it reaches the Mediterranean Sea at the Nile Delta.

Explanation:

3,724 feet, or 3,955 miles to the center of the Earth

Explanation:

a.indigo and cochineal

b.animal hides

c.silver and gold

e.cacao beans and sugarcane

there are no options provided but you can choose among the following gender-neutral pronouns: zir, hir, eir, vis, tem, eir.

in the normal course of maintaining a pronoun-antecedent agreement, we could have used the words his or her but since we are also required to use gender-neutral language, we need to replace it with its equivalent gender-neutral pronoun.