Photosynthesis starts when a photon- a tiny packet of light is absorbing a molecule of chlorophyll.
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three weak hydrogen bonds are between guanine and cytosine bonds</span>
A living entity is referred to as an organism. In order of size: cell, tissue,organ,organism.
Answer:
1.It helps to digest our food.
2.It is used as antibiotics to treat bacterial infection and disease.
3.It is used by humans to create food products such as cheese, yoghurt, pickles, soy sauce and vinegar.
4.It is use to break down our sewage and to clean up oil spills..