Answer:
Open channels allow an influx of sodium ions into the cytoplasm of the muscle fiber. The sodium influx also sends a message within the muscle fiber to trigger the release of stored calcium ions. The calcium ions diffuse into the muscle fiber.
Explanation:
D because they are complete systems
The zygosporangium of Rhizopus stolonifer function to
ensure the survival of the species by remaning dormat during unsuitable
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