Yungoos evolves into Gumshoos at level 20, during the day. Rockruff will always evolve into Lycanroc, but the form depends on the game you're playing. Midday form appears in Sun, and Midnight form appears in Moon. Type: Null evolves into Silvally with high happiness.
Skeletal muscles are the muscles found in your legs and arms and throughout the body. The skeletal system is different from the smooth muscle system in organs like your liver and the cardiac muscle in your heart because the skeletal muscles contract voluntarily.
The demands of exercise require that skeletal muscles must be able to, 1. contract and generate a wide range of tensions/force, 2. alter tension/force in small increments, and 3. do this repeatedly and rapidly for durations that may vary from a few seconds to several hours.