When a star is created from a nebula, what is the separate entity that it becomes called?
Red giant
Nebulae
Main sequence
Protostar

Red Giant

Explanation:

What do stars become after they are a nebula?

A star is born when the gas and dust from a nebula become so hot that nuclear fusion starts. Once a star has “turned on” it is known as a main sequence star. When a main sequence star begins to run out of hydrogen fuel, the star becomes a red giant or a red super giant.

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.