A nebula is a gigantic cloud of dust and gas. True or False?

Please help! It would be greatly appreciated!

~Kweenie~

True

Explanation:

A nebula is a gigantic space cloud of dust and gas. Several nebulae (more than one nebula) come from the gas and dust thrown out by the explosion of a star that is dying, like a supernova. Other nebulae are giant celestial dust clouds where new stars are starting to form. Nebulae are made of dust and gas—mostly hydrogen and helium.

True because the definition of a Nebula is a cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter.

b.

developed countries have tended to improve the environment, while developing countries have tended to damage it.