The marine biome
a) is a large ecosystem, but not larger than some terrestrial ecosystems
b) is characterized by four different zones
c) has little species diversity
d) covers a small portion of the earth’s surface

The correct answer is B.

The marine biome is one the most biodiverse biomes on Earth and It covers a large part of the earth surface ( three thirds of the Earth's surfaces are covered in water).

The marine biome can be divided into four zones:

The intertidal zone, the zone between the tides, rich in nutriens that come from the land.

The pelagic zone, the zone of the open ocean.

The benthic zone, the zone of the marine bottom with different sediments and rich in marine life because it includes the coral reefs.

The abyssal zone, or the deep sea zone. In this zone, there is a lack of light, but life still flourishes in various forms.

B. Is characterized by four different zones.

halogen, any of the six nonmetallic elements that constitute group 17 (group viia) of the periodic table. the halogen elements are fluorine (f), chlorine (cl), bromine (br), iodine (i), astatine (at), and tennessine (ts).