Define Phylum Ctenophora in short

Ctenophora comprise a phylum of invertebrate animals that live in marine waters worldwide. They are notable for the groups of cilia they use for swimming, and they are the largest animals to swim with the help of cilia. Depending on the species, adult ctenophores range from a few millimeters to 1.5 m in size.

Where Does Air Pollution Come From?

mobile sources – such as cars, buses, planes, trucks, and trains.

stationary sources – such as power plants, oil refineries, industrial facilities, and factories.

area sources – such as agricultural areas, cities, and wood burning fireplaces.

natural sources – such as wind-blown dust, wildfires, and volcanoes.

Explanation:

found on google