The bivalents are homologous chromosome containing a total of two chromosomes. On the other hand, tetrad is the homologous pair of chromosomes containing four chromosome.
If you know the half life of an isotope and the amount of it present, it is possible to calculate the numbers of decay events per second in the mass. This does not provide all the information about...
well, that's easy...a relationship is love, romance, friendship, and other stuff.....but a FORBIDDEN relationship is when someone forbids you.....you know....break up..