To find out how they form
Answer: B. True
Explanation:
The tissue tropism can be define as the ability of the microbe to infect specific cells and tissues of the host that supports the growth of particular microbe like virus and bacteria.
Some viruses have broad tissue tropism they can infect many cell types. Other viruese can infect only single cell or tissue type.
Physical Weathering would be nature related like the wind or rain. Chemical Weathering would be anything caused by a chemical reaction like acids or acidic rain.
I think that should help. If not let me know!
Every organism has a different life span so theres no exact answer, but i suppose it could range from a few hours to multiple years