2. To focus a microscope using the high power lens you must first in low power center the specimen and make sure it is in focus. Then switch to high power and adjust using the fine adjustment or the smaller knob.
3. It prevents dust from settling on the scope and in the lenses.
Gametophytes are photosynthetic & have root-like rhizoids.
I belive the answer would be "A" because the cell would be trying to delute the solution on the outside, and strenghting the solution on the inside.
