2. In IVF the fertilization is : a) Always External b) Always Internal c) Can be any one of the two d) Fertilisation does not occur

What is the function of nucleic acids

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

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?