As electrons move between the different components of the aerobic electron transport chain

Ablastocyst is a group of cells that forms after a human egg is fertilized. the blastocyst consists of two types of cells. some of these cells will become the placenta. what do the other cells develop into?

What type of cell division is used to replace old cell?

Which sets of mrna codons could genetically come for a protein with the following amino acid composition