The five main external factors that must be present or provided t sustain life are:
1. Water
2. Oxygen
3. Food
4. Atmospheric temperature
5. Atmospheric pressure
<span>The human body needs water, food and oxygen in order the body functions to work properly.
</span>Not every temperature is temperature at which the human can live. For example: we can not stay alive long period of time at temperature of 60 degrees Celsius.
It takes place in small things called chloroplast which have chlorophyll
The endometrium is the inner lining. The myometrium is the thick middle muscle. The serosa is the outer smooth layer.
Biomechanical mechanisms, habitat for plants and animals, participates in cycling of all materials used by living things.
