Black holes themselves can not be seen, nor do they leave trails (since emptiness does not have to be caused by a black hole), but there is evidence for black holes: scientists can see the effects of their gravity on nearby stars. The answer is B.
It was meant to help poor former slaves and poor white people in the south after the civil war. It provided food, housing, and medical aid
I think the answer either A or C
Answer: Austrian mountaineer Ludwig Purtscheller
Explanation:
The main idea of Toussaint L'Ouverture in this passage is that after being the first black republic carried out by slaves successfully in the world (Haiti in 1804), the citizens would not allow other countries, such as Great Britain or Spain, to take possession of their land again and get back to the situation and life they lived in slavery.