The following innovations and equipment have been a critical part to our exploration in Space or Space exploration on searching life on Mars. Such objects which are mostly unmanned gives us the information that the man can't reach in these generation and play a big part of charting the uncharted regions of the universe especially in Mars and becoming a tool to understand the world outside of our planet.
The rule of law is important for democratic forms of government because if the law is the highest rule, then it applies equally to all, which makes all people equals in the eyes of law, which is the highest form of democracy. All people, regardless of looks or social backgrounds are responsible for things in the same way.
Brown v. Board made segregations in schools illegal.
This would make the answer B.
The Olmec culture of the Gulf Coast of Mexico.
