3.10 Choose a specific ecosystem/location (for example; tide pools in San Diego). Research a list of specific species that have gone extinct or that are currently threatened with extinction (in the last 10 years). Describe the effect and/or harm that will result due to the absence of one of those species

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It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on