What’s the answers to a b & c?

Iknow #2 is d. i just need to know why

Afamily is one another name for a group on the table of elements.

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.