Why would you need to allow cells to grow for up to two weeks in order to make a chromosome spread?

Eristics do scientists use to distinguish between organisms in different kingdoms

How did the discovery of the rhesus factor affect society? o more patients died from having a transfusion with the wrong rhesus factor 0 new treatments during pregnancy could prevent harm to the developing child. o less donated blood could be used in the treatment of patients. the number of blood types was reduced by half

There are fewer than 100 naturally occurring elements in the universe, but there are millions of different unified substances. explain how this can be true.