A radioactive isotope decayed to 1/8 of its original mass after 60 minutes. Find the half-life of this radioisotope.

This is a mixture that has the same composition throughout.

An empty fuel tank can still contain and therefore can be even more dangerous than one full of liquid fuel.

Select each correct answer. more than one answer may be correct. which of the following is a characteristic of unicellular organisms? they can possess tissues and organs. all of their functions are performed by a single cell. they are usually microscopic. each of their cells is specialized to perform a specific function.