?

That would be the sun, because of its gravitational pull its what pulled the other planets closer, then making our solar system. However, the sun was formed after the solar nebula, but thats not an option, so the next thing made was the sun. I hope this helps you! :D

Answer is the sun

Explanation:

hope it helps u❤

option a is correct i.e.

explanation:

in context to the membrane of nerve impulse, the outer membrane of neuron is semi permeable that is only sodium ions can pass through the membrane i.e. smaller ions can pass through the membrane while larger ions cannot pass through it.

enzyme speed up the reactions