A compound is always a substance because it's made out of two or more atoms bonded together. Now a substance isn't always a compound because it takes two or more elements to create a compound in a chemical reaction, ans substances can contain only one element. In other words a substance can be constructed of one type of atom. Some substances that aren't compounds are: gold and baking soda.
Answer:
B. sodium
Explanation:
2 potassium ions are moved inside the cell and 3 sodium ions are moved out. So there is more sodium on the outside of the cell.
ACh released into the neuromuscular junction and binds to receptors on the sarcolemma
A phylogeny is a hypothesized relationship between groups of creatures that is represented by a cladogram. A scientist investigating phylogenetic systematics uses a cladogram to depict the groups of species being studied, their relationships, and their most common ancestors.