Which substance is considered a building block for all living things?

Consider an organism that is eukaryotic, found in both unicellular and multicellular forms, may resemble a plant but is not photosynthetic, has chitin in its cell walls, and absorbs organic nutrients from decomposing material in the environment. this organism would be classified as which of the following types of organisms? a. fungib. protozoac. bacteriad. archaea

Which of these parts of the membrane large moecules pass through it ?

_tissues respond quickly to outside stimuli a) epithelia b)nervous c)muscular d)muscular and nervous