What is the sciatic notch? how can it be used to determine gender?

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 .

Which type of respiration takes place when there is no oxygen present

Whats one way that rocks do not follow the typical rock cycle pathway?