Aretrovirus is different from other viruses because

it cannot infect humans
it has dna for genetic material
it is considered to be living
it has rna for genetic material

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint

those characteristics are cellular organization, reproduction, metabolism, homeostasis, heredity, response to stimuli, growth and development, and adaptation through evolution. some things, such as a virus, demonstrate only a few of these characteristics and are, therefore, not alive

air enters through the nose, moves through the nasal cavity, the pharynx, the larynx, enters the trachea, moves through the bronchi andbronchioles till the alveoli.

a compound light microscope is used to magnify objects in steps.  

hope it