In some small birds and bugs the number of chromosomes is hard to determine

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?

What are the three groups of atoms that make up amino acids called

Where does oogenesis take place ? seminiferous tubules fallopian tubes ovaries uterus