On a karyotype, which pair(s) of chromosomes are always the sex chromosomes (no matter what the organism is)? A. the 23rd pair B. the last pair C. the first pair D. all of them

Plz will mark! the diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

If water were a non polar molecule, how would its properties be different ? a.) water would be a much lighter molecule b.) water would be able to climb up inside plants c.)water would not be able to form hydrogen bonds d.) water would stick together much more strongly

What are the two main phases of a cell cycle