Answer:
Separation between sarcomeres.
Explanation:
The structure of the muscle fibre is composed of many functional units called sarcomere which is interrupted by the discs called Z-discs.
These Z-discs are made of the alpha-actin homodimers which allow the actin filament allows to bind to it along with other proteins. The Z-discs since present at regular intervals in a muscle appears to separate the sarcomere and defines the boundaries of the sarcomere.
Thus, the selected option is correct.
No not if there are factory or houses that causes stuff like global warming
I think electric but im not sure tho.....
As far as is known, at its birth 4.6 billion years ago, our planet was an inhospitable pile of rocks accreted from cosmic debris, hot inside and cooling on the outside. Water and an atmosphere were present and crustal rocks began to form at once (the oldest being 4.3 billion years old).