Which statement best describes comparative and descriptive investigations? O They both include a question, procedure and conclusion.
O They both include a hypothesis.
O They both require a specified control group.
O They both use independent and dependent variables.

Which of the following is the best definition of a eukaryota? a. a one-celled organism that does not have a membrane-bound nucleus b. a one-celled organism that does not have a cell wall c. an organism whose cells each contain a membrane-bound nucleus d. an organism whose cells each have a cell wall