Will mark brainliest if correct!
question: a skeletal muscle is a composition of several components bundled one into the other. at which structural level in the muscle does contraction occur to bring about contraction in the whole muscle?
answer choices:
a.) myofibril
b.) muscle fiber
c.) myoneural junction
d.) tendon
e.) fascicle

I'm not sure but I'd say A. Myofibril

*cross fingers*

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.

the answer is c. altitude. hope this ! #brainiac