Skeletal muscle is controlled by the organism. Which best describes what this means in terms of movement?

Any muscle attached to the skeleton is voluntary and may be used for movement.
Some of the muscle attached to the skeleton is involuntary and may be used for movement.
Some of the muscle attached to the skeleton is voluntary and may be used for movement.
All of the muscles attached to the skeleton are involuntary and may be used for movement.

where are the vectors ?

layers of the earth affect the waves and these effects are seen on instruiments such as seimometers

the higher the current the higher the mag field around it the higher the influence on the compass

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.