Will rate and give

which statement describes the formation of the milky way galaxy?

a) a disk formed of long trails of stars coiled into a spiral
b) it formed an elliptical flattened disk
c) heat and gases contracted within a nebula
d) gravity pushed stars away from a center core

May someone me with these science questions

What was bohr’s contribution to the planetary model

Alidded glass container is filled with a colored gas. after a period of time, it is observed that the gas is uniformly spread throughout the box and that the movement has slowed considerably. next, a warm iron plate is carefully placed under the box. why is there resumed movement of the gas in the container?