Which objective lens must you always rotate into place, before and after focusing on a specimen

Explain nonnuclear inheritance. ~ ap biology

Witch type of microscope is used to view very small cell components like proteins and dna?

What are the possible blood types among the children of parents that are ab and ii? oa) types a and b ob) types a, b, and ab c) types a, b, and o od) types a, b, ab, and o