4. Which of the following systems does NOT represent a force pair? A When you push on a bike's brakes, the friction between the tires and
the road increases.
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B When a diver jumps off a diving board, the board pushes the diver up.
C When an ice skater pushes off a wall, the wall pushes the skater off
of the wall.
D When a boy pulls a wagon, the wagon pulls back on the boy.

c

Explanation:

the wall is remaining still and has no force to be able to much the skater

i think its control and coordinate because im pretty sure thats what tissue does and the joints are what control movement and then your skeletal/ bones provides portection. hope that .

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides