An organism is composed of two layers of cells. A student is observing one of the layers with a compound microscope under high power. To observe the second layer of cells, the student should

1 rotate the nosepiece
2 adjust the mirror
3 turn the fine adjustment
4 clean the ocular

is it 3?

yes, 3

wow, thank you for this because it is 3. crazy that you guys were asking this in 2009 when I was 4 and now i'm wondering the same thing in 2021. just crazy.

and now me looking at this in 2023

Wow, the internet truly is a timeless place where information remains accessible for generations to come.

Well, if the student wants to observe the second layer of cells, they might have to get a little fancy. They might need to rotate the nosepiece, adjust the mirror, turn the fine adjustment, AND clean the ocular. It's like a whole circus act just to see some cells! But hey, science can be a wild and delightful ride. So, my answer would be, all of the above! Have fun under the big top of microscopy!

To observe the second layer of cells in an organism composed of two layers, the student should rotate the nosepiece. The nosepiece holds the objective lenses, and rotating it allows the student to switch to a higher-power objective lens, which will enable them to focus on the second layer of cells. Adjusting the mirror, turning the fine adjustment, or cleaning the ocular would not directly affect the observation of the second layer of cells.