A large class of molecules is called a macromolecule.
A species must have an appropriate food source, not have too many predators feeding on them, and have a suitable climate for which the species is adapted to.
Red blood cell is shaped as a biconcave discs, this shape allows them to squeeze through small capillaries.
The biconcave shape of the cell allows oxygen exchange at a constant rate over the largest possible area. The biconcave shape increases the cell's surface area compared to a flat disk of the same size. The greater surface area makes it easier for gases to move into and out of the red blood cell.
The biconcave shape provides a large surface area compared to the volume of the red blood cell, allowing diffusion to happen efficiently. This shape optimizes the ratio of surface area to volume, facilitating gas exchange. It also enables them to fold up as they move through narrow blood vessels.
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Phagocytosis is defined as a process of ingestion of bacteria or other infectious agent by phogocytes.
In human beings, the major and professional phagocytes are White Blood cells. These cells are specialized in attacking infectious agents that enters the body and kill them by engulfing them.
In protozoan, the phagocytosis starts with the ingestion step, in which an infection agent is taken up by protozoans and form a special vacuole like structure which secretes lysosomes enzymes that attack the agent and kill it and then removed from body by egestion.
Hence, there is not any significant difference between the process of phagocytosis in humans and protozoan; however the steps included vary in both.
