How is a signal from a presynaptic neuron transmitted to a postsynaptic cell

At which point is crust neither created nor destroyed? island chain mid-ocean ridge divergent boundary transform boundary

The structure of a dna molecule is best described as a. one long strand of nucleic acids b. two strands of dna nucleotides joined by hydrogen bonds c. two strands of amino acids joined by hydrogen bonds d. one long strand of amino acids

Why are human population trends difficult to predict?