In order for an impulse to cross the synaptic gap between
the neurons, the impulse must be converted into a chemical signal as this will
allow it to exert effects and to be able to travel in distances such as having
to cross the synaptic gap between the neurons.
The answer is; The closer two genes are on a chromosome, the lower the probability that a crossover will occur between them
The closer together two genes are on a chromosome, the higher the likelihood that they will be inherited together. This is referred to as genetic linkage. The higher the genetic linkage the lower the recombination frequency of the two genes.
36 molecules
I hope that helped
Waters Lower density while in a solid form is due to how the hydrogen bonds are formed as it freezes, water molecules are apart compared to liquid water. The structure of ice makes it less dense than free flowing molecules in the liquid water, giving it the ability to float on water.
A secondary source is anything written after the fact