Which is an example of a single celled organism?
Why do multi-cellular organisms need transport systems?
Which statement best describes a bacterial cell?
Which characteristics do single-celled organisms and multi-celled organisms have in common?
A scientist is trying to decide whether an organism is unicellular or multi-cellular. Which information would help the scientist most to make her decision?
Which of the following is a multi-cellular organism?
Knowing how many cells an organism is composed of allows us to classify it into one of which two groups?