When light energy excites elektron in photosystem ii where do the electron's to replace them come from

when light is absorbed by one of the pigments in Photosystem II, energy is transferred thereby exciting an electron to high energy level. This excited electron is passed on to the acceptor molecule and gets replaced with an electron that comes up while splitting of water molecules.

each of the 46 original chromosomes splits into two daughter chromosomes, so there are two sets of 46 daughter chromosomes that end up in each cell. human cells have 46 chromosomes. each chromosome consists of a pair of identical chromatids attached together by a structure called a centromere.

halogen, any of the six nonmetallic elements that constitute group 17 (group viia) of the periodic table. the halogen elements are fluorine (f), chlorine (cl), bromine (br), iodine (i), astatine (at), and tennessine (ts).