Name one strain of the bacteria that usually lives harmlessly in the digestive tracts of humans.

Below, the levels of organization in a multicellular organism are shown from least to most complex. which level of organization can be described as several different types of tissues working together to perform a common task?

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Which characteristics are typical of a human population in the postindustrial stage?