In nuclear power plants, atoms are split during fission reactions to produce an enormous amount of heat. This heat changes pure water into steam, and the steam is used to turn a series of turbines connected to an electric generator. To cool the steam and condense it back into water so it can be used again, excess heat must be absorbed using water from a separate source. In "once-through" cooling systems, water is pulled from a nearby body of water, used to condense the steam, and pumped back into the same body of water at an increased temperature. In many cases, once-through cooling systems can cause the temperature of the entire body of water to increase, which can disrupt aquatic ecosystems.

A diagram of a nuclear reactor with a once-through cooling system is shown below. In the diagram, warmer water is shown in red and cooler water is shown in blue.

once-through%20cooling%20system

Suppose the operators of a nuclear power plant want to modify their once-through cooling system to reduce the plant's impact on nearby aquatic ecosystems without affecting the system's cooling capabilities. A viable solution would most likely reduce the
of water entering the

because of

question#1

ans:

cell is the basic unit of organization of all living things. cells are often called the building block of life and it is the smallest unit of life. the study of cell is called cell biology. cell consists of cytoplasm enclosed within membrane, which contain bio-molecules such as proteins and nucleic acid.

two third of cell is water, which means that two-third of your whole body is water. the rest is the mixture of molecules, mainly proteins, lipids and carbohydrates.

question#2

ans:

organ:

an organ is a group of tissues specialized to form a functional unit. an example is the heart in animals.

organ system:

an organ system is a group of several organs whose functions are synchronized to release an effective action in a living organism. an example is digestive system.

question#3

different systems perform different function at tissue level. for example, the respiratory system facilitates breathing. in the alveoli tissue of the lungs, the exchange of oxygen and carbon dioxide molecules between the air and the bloodstream occurs by passive transport, so that oxygen is taken in and carbon dioxide and water are removed. different systems of the body carry out different functions. for example, your digestive system is responsible for taking in and processing food, while your respiratory system working with your circulatory system is responsible for taking up oxygen and getting rid of carbon dioxide.

question#4

different systems perform different function at tissue level. for example, the respiratory system facilitates breathing. in the alveoli tissue of the lungs, the exchange of oxygen and carbon dioxide molecules between the air and the bloodstream occurs by passive transport, so that oxygen is taken in and carbon dioxide and water are removed. different systems of the body carry out different functions. for example, your digestive system is responsible for taking in and processing food, while your respiratory system—working with your circulatory system is responsible for taking up oxygen and getting rid of carbon dioxide.

question#5

our body works because of the interactions that happen between organs and organ systems.  

for example:  

the heart to regulate blood flow throughout the body. the blood carries oxygen and nutrients to the cells and carries carbon dioxide and waste away from the cells. body systems work together in maintaining a constant internal environment. when this balance is disrupted, the body systems may not function properly, and human health can suffer.   you start to feel bad.