The defense system of the human body is made up of entire organs and vessel systems like the lymph vessels, but also of individual cells and proteins. The inner and outer surfaces of the body are the first barriers against pathogens (germs). These surfaces include the skin and all mucous membranes, which form a kind of mechanical protective wall.
Several things support this protective wall:
<span><span>- The body’s own antibacterial substances can disable different pathogens from the environment at an early stage. A certain enzyme found in saliva, the airways and tear fluid destroys the cell walls of bacteria.
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- Many pathogens that are breathed in get stuck to mucus in the bronchi and are then moved out of the airways by hair-like structures called cilia.
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- Most pathogens that enter the body together with food are usually stopped by stomach acid.
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- Normal flora, harmless bacteria that reside on the skin and many mucous membranes in the body, also help to protect the body.</span></span>
The cough and sneeze reflex can also help to remove pathogens.
Hope this helps (:
The loan from d to e represents evaporation
Provide sperm to fertilize the eggs in the female reproductive system.
Answer:
No, they don't always look like the parents.
Explanation:
They won't always look like the parents because from each parent, they will receive different dominant and recessive traits. In addition, certain traits skip generations or don't get passed down. For example, you can have 2 parents with red hair and have dark brown hair, but have a child who DOES have red hair.
The carbon cycle illustrates how carbon, which is found in all living and once living things, is cycled and recycled from organisms to the soil and back to living things...matter is neither created or destroyed so the carbon we find in us, etc is the same carbon found in the earth since its "birth"
