Answer:
The first evidence of helium was obtained on August 18, 1868 by french astronomer jules janssen.
Explanation:
For some time helium was believed to exist only in the sun. However in 1882, Italian physicist Luigi Palmieri detected helium on earth when analyzing lava from mount vesuvius after it erupted in that year.
The decision in Dred Scott v. Sandford i believe.
The name given to the expanded and ripened ovary of a plant is a fruit. It is also eluded to in the question itself when it says, "ripened".
A recent example of checks and balances is the Courts’ check and balances on President Trump’s immigration policy. This is when a federal judge in Washington issued an injunction against his visa executive order and thus preventing visa restrictions from taking effect
