This happens when two chromosomes pair up and exchange segments of DNA. Why is crossing over an important part of meiosis?

Time ! for a smell to begin the process of registering in your brain, first you must a) inhale odor molecules into the nasal cavity b)transduce scent chemicals c)have a scent to inhale d)all answers can work

Are the layers of rock above and below the coal older or younger?

How do ratio scale and diagrammatic scale work