Which of the following features does not distinguish humans as a member of phylum chordata?
human embryos undergo indeterminate cleavage.
a spinal cord runs along an adult human’s dorsal side.
human embryos exhibit pharyngeal arches and gill slits.
the human coccyx forms from an embryonic tail.

Cuz i said so. which gives it to b

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