8. If cold viruses invade your body, your
body's immune system may destroy most
but not all of these viruses. How does yoj
body's immune system affect the evolutio
of the cold viruses?

The speed of  sound:   sound travels  at different speeds depending on what it istraveling through. of the three mediums (gas, liquid, and solid)  sound waves travel the slowest through  gases, faster  through  liquids, and fastest  through  solids.

An ecosystem is in a certain area and includes living and non living plus there is weather conditions and a biome is a large amount of area with similar climate.so ecosystem is based on weather and biome is based on the average climate 

Sorry  i don't understand can you rephrase that