List and briefly describe the three main cell cycle checkpoints.

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 .

What is the 77 element on the periodtic table

At which location in earth’s interior does the top density continue to increase as thickness decreases?