Can someone please help. Whoever is good at chemistry please help

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.

Which of these conditions most likely produces an unstable isotope?

One similarity and one difference between an element and a mixture of elements