Sam has been working to improve his muscular fitness. he jumps rope and trains with weights. what will most likely be the result of sam's efforts?

increase bone density

Explanation:

Sam in an effort to improve his muscular fitness jumps rope and trains weights. The result of the Sam's effort would his increased bone density.

Several research have shown a positive impact of exercise on bone density.A regular Pelvic exercise for 30 days increase the hip bone density significantly.

Similar is case of other exercises as well. Doctors recommend exercise to improve bone mass density

d) the number of neutrons plus the number of protons

layer a is the exosphere and layer b is the thermosphere.   is the answer i think but i hope this .