If a hydrogen atom has two neutrons and one proton, what is the mass number

Explain how fossils scientists make discoveries about the lives of organisms and about how environments have changed over time. plz hurry up it time

~fourth largest plate ~includes parts of the indian and atlantic oceans ~subducts below the eurasian plate on the west side ~ the arabian and somali plates form boundaries with it what is the name of the tectonic plate described above? a) african plate b) eurasian plate c) north american plate d) indo- australian plate

During which phase does earth see more than half of the moon's surface? 1)first quarter2)third quarter3)waxing gibbous4)waning crescent