[Solved] There is usually a time difference ________. A) between transmission from the sender to his or her mail server and the transmission to the receiver's mail server B) between transmission to the receiver's mail server and the reading of the message by the receiver. C) both A and B D) neither A nor B Micrographs: Photographic or digital images taken using a microscope to magnify objects that are too small to be seen by the naked eye. Megakaryocyte: A large bone marrow cell responsible for the production of blood thrombocytes (platelets), which are necessary for blood clotting. Monocyte: A monocyte is a type of white blood cell part of the human body's immune system that fights off viruses, bacteria, and fungi; these cells can differentiate into macrophages and dendritic cells. Hematocrit Value: The proportion of blood volume that is occupied by red blood cells, expressed as a percentage.