Match the following:

a. Epipelagic zone	1. The ocean's deepest trenches contain a colder, darker zone.
b. Hadopelagic zone	2. Strange ocean species live in this area of the ocean, some of which cannot survive at the surface because their body structures require high water pressure at depth.
c. Abyssopelagic zone	3. Photosynthetic ocean life, such as coral and seaweed, can be found here.

The correct answer is: a - 3, b - 1, c - 2

• Ocean is a type of aquatic ecosystem
• Ocean is divided into 5 layers or zones, which are as follows:

1. Epipelagic zone: Also called sunlight zone, which is characterized by light and warmth received from sunlight. This is the thinnest layer with most of the living organisms in it.
2. Mesopelagic zone: Also called twilight zone, which forms 20% of ocean depth. Bioluminescent layer is found in this layer.
3. Bathypelagic zone: Also called dark zone, characterized by light produced by the organisms that live in it. Organisms like whales, squid, octopus, etc are found in this layer.
4. Abyssolpelagic zone: Also called abyssal zone, is characterized by no light at all. The pressure is greater and only few invertebrates are found in this layer.
5. Hadalpelagic zone: Also called Hadal zone, characterized by trenches and canyons. The pressure is greatest here and forms the ocean bed.

• The correct option is a - 3, b - 1, c - 2