what are similar cells grouped together to form?

what are tissues grouped together to form?

what are organs combined to form?

what is cell differentiation?

how does a cell differentiate?

what is the term for when a gene is switched on?

along with the shape of a cell, what does differentiation also vary?

give an example of two cells containing different numbers of organelles

what is a tissue?

what are two examples of tissues?

what is an organ made up off?

which blood vessels are considered organs?

which blood vessel is not considered an organ?

what are three systems?