Channel proteins help large molecules pass through the cell membrane.
Active transport requires ATP molecules and can happen only in living cells
Meiosis II the chromosomes are pulled to the center of the cell and line up randomly at the equato
Anaphase II the centromere of each chromosome splits
-the sister chromatids separate and move to opposite poles
Uhh her parents I guess? not really a doctor you should talk to because that’s just growing up for women.. all of them get their periods, it’s not abnormal