Answer:
by looking at their physical features, the fossil record, and dna sequences
A forest fire that was caused by lightning
Answer:
conservation is saving and reducing. To help save the earth .. Conservation is the preservation or efficient use of resources,
Explanation:
I think Autorhythmic fibers are fibers that are self excitable or on their own for example some cardiac muscle. They repeatedly generate action potentials that trigger heart contractions.They continue to stimulate a heart to beat even when it is removed from the body. In comparison to contractile fibers, autorhythmic fibers are self excitable and do not require nervous system stimulation to trigger contractions. Contractile fibers have stable resting membrane potentials of -90mV, when a contractile fibers reaches threshold by action potential, the voltage gated fast sodium ions channels will open.
