Is this problem multiple choice? I remember much of biology but I'm blanking on vocab
The alveoli are lined with mucus and are surrounded by a network of blood capillaries. They have very thin walls for gases to be absorbed through.Carbon dioxide diffuses from the blood into the alveoli.
Viruses can only replicate with in a cell or living tissue applies to a viral infection.
Viral infections are infections that are caused by viruses. Viruses are microscopic organisms that contains a core of genetic material (DNA or RNA) enclosed by a protein coat. Viruses are not made of cells and they are very tiny and smaller than bacteria. Viruses require a living cell (host organism) to replicate and produce other viruses similar to them. Viral infections cannot be treated with antibiotics, antiviral medicines are used instead. Examples of viral infections include; common cold, flu, smallpox, HIV/AIDS and Ebola.
The term "biogeochemical<span>" tells us that biological, geological and chemical factors are all involved. The circulation of chemical nutrients like </span>carbon, oxygen,nitrogen, phosphorus, calcium, and water etc. through the biological and physical world are known asbiogeochemical cycles<span>.</span>