Lymph vessels send lymph fluid through nodes throughout the body. Lymph nodes are small structures that work as filters for foreign substances, such as cancer cells and infections. They contain immune cells that can help fight infection by attacking and destroying germs that are carried in through the lymph fluid.
Answer:
Respiratory System and the Muscles of Inhalation and Exhalation. The muscular and nervous systems enable the involuntary breathing mechanism. The main muscles in inhalation and exhalation are the diaphragm and the intercontinental (shown in blue), as well as other muscles.
- Make sure taps and such have no leaks.
- Keep a bucket underneath taps and use the water saved in them for gardening.
- Avoid flushing the toilet when unnecessary ("If it's yellow let it mellow, if it's brown flush it down"). And avoid throwing tissues in the toilets, instead throw in a proper bin.
- Never put water down the drain when there may be another use for it such as cleaning or watering a plant or garden.
- Water lawns during the early morning hours when temperatures and wind speed are the lowest. This reduces loss from evaporation.
<span>- In the school yard, use mulch to retain moisture in the soil. Mulching also helps to control weeds that compete with plants for water.
</span>
physical defense
chemical defense
camouflage
social defense