Gastropods have the following characteristics: have a single spiral shell, have internal fertilization, use a radula to scrape algae or to create a hole in the shell of another mollusk. * True
False
Other:

The answer is joseph is observing the colour of the reaction mixture to see whether proteins are present in the given solution.

Where are the following

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