In the Java programming language, a keyword is one of 50 reserved words that have a predefined meaning in the language; because of this, programmers cannot use keywords as names for variables, methods, classes, or as any other identifier. Due to their special functions in the language, most integrated development environments for Java use syntax highlighting to display keywords in a different colour for easy identification.
Simple definition of a transport system in biology: A transport system is a means by which materials are moved (' transported ') from an exchange surface or exchange surface. to cells* located throughout the organism.* Not all individual cells require all of the many different types of materials carried by a transport system. transport system is a means by which materials are moved (' transported ') from an exchange surface or exchange surface. to cells* located throughout the organism.
However, if cells do need to use energy to get particles through the cell membrane this is called active transport. Passive transport Passive transport: diffusion. Some substances pass through small holes in the surface cell membrane. This is called diffusion and does not require the cell to expend energy. Oxygen gets into a cell and carbon dioxide (the product of respiration reactions) leaves it this way.