The anser is b
The anser is d my bro
mostly collagen and some calcium phosphate
If the Na+ voltage-gated channels in a muscle cell open, the Na (sodium) ions rush inside the muscle cell and makes the cell more positive as Na ions carry positive charge on it. Due to the entry of positively charged ions inside the cell, the cell becomes less negative and more positive. This is called depolarization of cell.
It’s A because when changing it to scientific notation it goes to 2.75 and when going to the left from the decimal point it is negative
I am more of a chemistry person, but my best answer is the double-helix structure. The DNA rotate around a central point allowing it to keep a constant distance
