If a bunch of grapes represents a molecule, what does each grape in the bunch represent?
a cell
a tissue
an atom
an organ

Assume that a student is given two different models of bacteria, with one model consisting of big bacteria and the other consisting of small bacteria. how can the student demonstate the theory of endosymbiosis using the models

Which of the following is a consequence of urban heat islands? increased precipitation downwind of the city? increased precipitation upwind of the city? decreased winds within the city? increased winds within the city?

Which worm has eyespots that are used to detect light? a fluke b marine worm c planarian d tapeworm