why does the central part of a red blood cell appear paler than the outer part when viewed under a light microscope

The picture showed normal blood cells which are around and sickle cells which appear much longer people with sickle-cell suffer from the sickle cell anemia which is inherited diseaseit is caused by a change in gene responsible for production of hemo goblin this type of change is known as an

When ash and dust begin to settle on the ground, they eventually become compacted by

Does all the energy stored by the phytoplankton reach the top level of the pyramid