Sometimes the word man or mankind is used when referring to all human beings (both male and female):
Throughout history, man has worshipped gods or spirits.
The universe will never be completely understood by mankind.
However, some people consider this sexist, so it is better to use humans or humankind:
Throughout history, humankind has worshipped gods or spirits.
The universe will never be completely understood by humankind.
Humans first migrated to the Americas 15,000 years ago.
This spider's venom is deadly to insects, but harmless to human beings.
Humans and human beings use the plural form of the verb, but humankind uses the singular form of the verb:
humankind has worshipped gods
humans have worshipped gods
We often use humans or humankind when making broad statements about humanity in general. Human beings is often used when contrasting humans with animals, or when encouraging people to treat each other "like human beings" (meaning with respect and fairness).
Faced with the choice between organic produce from the other side of the world and locally produced nonorganic foods, go for the local option to reduce environmental pollutants resulting from transport that may have an aging effect on body systems. Local food should not have spent too long in storage and so may contain more vitamins.