His muscle cells have experienced aerobic resipiration;carbon monoxide
The cells of the immune system
Answer:
how a freshwater ecosystem, such as a pond, can change into a terrestrial ecosystem.
Explanation:
A channel protein serves as a tunnel across the membrane into the cell. More specifically, channel proteins help molecules across the membrane via passive transport, a process called facilitated diffusion. These channel proteins are responsible for bringing in ions and other small molecules into the cell
