Where does a virus attach to a host cell?

Attachment is achieved when receptors on the capsid or viral envelope become connected to complementary receptor proteins on the cell membrane of the target cell.

It attaches onto the complimentary receptor proteins

They formed the oceans.  as they melted water was formed and the water made the oceans

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