4. Which of the following would be an organ system:* O heart, stomach and intestines
O stomach, intestines, mouth
O skin, brain, liver
5. Which are the 6 most common elements in living things?
carbon
helium
oxygen
hydrogen
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nitrogen
phosphorus
sulfur

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 .

Compare the composition of the moon's surface with the composition of the earth's surface.

Multicellular organisms use cell division, mitosis, for growth and the maintenance and repair of cells and tissues. single-celled organisms may use cell division as their method of reproduction. regardless of the reason for mitosis, the process ensures genetic continuity. what is the step in the cell cycle that ensure genetic continuity?