The concentrations of ions are very different inside and outside a nerve cell due to

How do you transfer mrna into codons ? i'm so confused : (

What causes eclipses? check all that apply. earth's rotation on its axis moon's shadow covering the sun earth's shadow covering the moon earth's orbit and moon's orbit occasionally aligning the moon and sun's gravity pulling in the same direction

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.