Question

deep sea zones: a virtual field trip
website: https://www.naturalworldfacts.com/the-deep-sea-zones
directions: use the website above to answer the questions for each of the five deep sea zones.
part 1: epipelagic (sunlight zone)

1. what is the main characteristic of this zone? why is it nicknamed the \sunlight zone\?
2. what is the primary source of food for organisms in this zone?
3. name two organisms that live in the sunlight zone.

part 2: mesopelagic (twilight zone)

1. how much sunlight reaches this zone? what is the purpose of the bioluminescence of many animals found in this zone?
2. describe the process of the \daily vertical migration.\ why do animals do this?
3. name two organisms that live in the twilight zone.

part 3: bathypelagic (midnight zone)

1. how does the temperature and pressure in this zone compare to the zones above?
2. what is the only source of light in this zone? how do organisms use this light?
3. name two organisms that live in the midnight zone.

part 4: abyssopelagic (abyssal zone)

1. what does the word \abyss\ mean?
2. describe the environment in the abyssal zone. what are two major challenges organisms face here?
3. name an organism that lives in the abyssal zone.

Explanation:

1. The Epipelagic zone is the top - most layer of the ocean where sunlight can penetrate, which is why it's called the "Sunlight Zone". Phytoplankton, which perform photosynthesis using sunlight, are the primary food source. Organisms like dolphins and tuna live here.
2. In the Mesopelagic zone, only a small amount of sunlight reaches. Bioluminescence in animals here is used for communication, attracting prey, and camouflage. Daily vertical migration is when animals move up to the Epipelagic zone at night to feed on plankton and return to the Mesopelagic zone during the day to avoid predators. Organisms such as lanternfish and hatchetfish live here.
3. The Bathypelagic zone has lower temperatures and higher pressures compared to zones above. Bioluminescence is the only light source. Organisms use it for similar purposes as in the Mesopelagic zone. Anglerfish and gulper eels live here.
4. "Abyss" means a very deep or bottomless chasm. The Abyssal zone has cold temperatures, high pressure, and low food availability. Organisms here face challenges like finding food and withstanding high pressure. An example of an organism is the giant squid.

Answer:

1. Main characteristic: Sunlight can penetrate. Nicknamed "Sunlight Zone" because it receives sunlight.
2. Primary food source: Phytoplankton.
3. Organisms: Dolphins, Tuna.
4. Sunlight: Only a small amount. Purpose of bioluminescence: Communication, attracting prey, camouflage.
5. Process: Animals move up to the Epipelagic zone at night to feed and return to the Mesopelagic zone during the day to avoid predators. Reason: To feed and avoid predators.
6. Organisms: Lanternfish, Hatchetfish.
7. Temperature: Lower. Pressure: Higher compared to zones above.
8. Light source: Bioluminescence. Use: Communication, attracting prey, camouflage.
9. Organisms: Anglerfish, Gulper eel.
10. Meaning: A very deep or bottomless chasm.
11. Environment: Cold, high - pressure, low food availability. Challenges: Finding food, withstanding high pressure.
12. Organism: Giant squid.