The life cycle of nonvascular plants includes an alternation of generations between a

a.
diploid sporophyte and a diploid gametophyte.
b.
haploid sporophyte and a haploid gametophyte.
c.
diploid sporophyte and a haploid gametophyte.
d.
haploid sporophyte and a diploid gametophyte.

A.
diploid sporophyte and a diploid gametophyte.

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

Well i had the same answer, so the correct answer would be a. but in this case it would be the one with plasma membrane and cell wall circled that is next to the hairy pill type of thing.