Manned missions into the far reaches of outer space could require astronauts to be in weightless environments for years at-a-time. which of these is an effect of prolonged weightlessness on the human body?
a.
a stronger heart
b.
a loss of bone mass
c.
a weaker immune system
d.
a lack of sleep

Ionic compounds are made of ions, and yet the overall charge of an ionic compound is neutral. why?

Hey guys so i need to know what is _nh3+> nh4oh ~chemistry~

Which of the following describes a compound? (hint: carbon and oxygen bo a. a piece of pure carbon, containing only carbon atoms b. oxygen gas surrounding a solid piece of carbon c. a substance made of two oxygen atoms for each carbon atom carbon and oxygen atoms mixed without being bonded together