Which observation proves that a cell is a eukaryote? A. It has ribosomes inside the cell. B. It is surrounded by a cell membrane. C. It has enclosed organelles inside the cell. D. It has DNA in the cell.

After getting the slide and microscope ready, stella is eager to see the microscopic pond water specimen! she crouches around her microscope and aligns her eye with the microscope’s eyepiece. but she's only able to see a bright white light. at this point, no specimens or cells are visible on stella's pond water slide. after taking a moment to collect her thoughts, stella realizes she can't see any lifeforms because .

Organisms are classified, or grouped into categories, based on similarities in their characteristics and/or evolutionary relationships. the study of how organisms are classified is known as

Which of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi