Which biome covers the largest part of earth's surface?

grassland
polar
marine
tropical rain forest

The oceans cover the earth's surface by approximately three-fourth or seventy five percent. It is the oldest and the largest biome. Thus, the marine biome is the largest biome which covers the earth's surface. This biome also is the common link among the other biomes in Earth.

The correct answer is  b) 

Aneutral atom must have the same number of neutrons and protons? no, they must have the same number of protons and electrons