What is marine pollution usually? The most abundant organisms in the ocean are

Ocean is a geographical term, referring to the vast waters on the earth's surface separated by the continents, and the vast waters that are interconnected. The ocean consists of two parts: the sea and the ocean. The central part of the water is the ocean, and the part close to the land is the sea. Living species living in the ocean are collectively called marine life, which includes marine animals, marine plants, microorganisms and viruses. Today we mainly share what marine pollution usually refers to?

Contents of this article

1. What does marine pollution usually refer to?

2. The most common organisms in the ocean are

3. What is the longest-lived marine organism?

What does marine pollution usually refer to?

Marine pollution usually refers to human beings changing the original state of the ocean and destroying the marine ecosystem. The Intergovernmental Oceanographic Commission under UNESCO clearly defines marine pollution as the direct or indirect introduction of substances or energy into the marine environment due to human activities, which causes or may cause damage to marine biological resources and endanger human health.

The ocean has a vast area and a huge water storage capacity, and therefore has long been the most stable ecosystem on Earth. Various substances that flow into the ocean from land are accepted by the ocean, but the ocean itself has not undergone significant changes. However, in recent decades, with the development of world industry, ocean pollution has become increasingly serious, causing great changes in the local sea environment, and there is a tendency to continue to expand.

The turbidity of seawater caused by marine pollution seriously affects the photosynthesis of marine plants, thereby affecting the productivity of water bodies and endangering fish; heavy metals and toxic organic compounds accumulate in the sea and are enriched by marine organisms, causing poisoning to other animals and even humans who feed on them.

Oil pollution forms a large oil film on the ocean surface, preventing oxygen in the air from dissolving into the seawater. When oil decomposes, it consumes dissolved oxygen in the water, causing seawater hypoxia and harming marine life. Organic pollution can cause eutrophication of seawater, abnormal algae reproduction, red tides, and damage to the ecological balance. Now, marine pollution has attracted more and more attention from the international community.

The most abundant organisms in the ocean are

The most numerous organisms in the ocean are plankton. Organisms living in the ocean are called marine organisms, which include marine animals, marine plants, microorganisms and viruses, etc. Among all marine organisms, plankton is the most numerous one, and common plankton includes krill, jellyfish, and jellyfish.

Ocean is a geographical term, referring to the vast waters on the earth's surface separated by continents. It is a vast body of water that is interconnected. The ocean consists of two parts: the sea and the ocean. The central part of the water is the ocean, and the part close to the land is the sea. The total area of ​​the ocean is 360 million square kilometers, accounting for more than 70% of the earth's surface area, which is much larger than the land area.

Living species living in the ocean are collectively called marine life, which includes marine animals, marine plants, microorganisms and viruses, etc. Marine animals include invertebrates and vertebrates. Invertebrates include octopus, squid, and various shells, etc., while vertebrates include common fish and large marine animals such as sharks, whales, etc.

Among all marine organisms, plankton is the most numerous and far outnumbers other marine organisms. Plankton refers to organisms that live in water and have no or very weak mobility. They can be divided into two categories: phytoplankton and zooplankton. Most of them are tiny and invisible to the naked eye, and move mainly under the control of water currents.

What is the longest-lived marine creature?

The longest-lived marine creature: the Turritopsis dohrnii. The Turritopsis dohrnii is the only known creature that can revert from sexual maturity to the larval stage, which is equivalent to "rejuvenation". In theory, there is no limit to the number of times the Turritopsis dohrnii can "rejuvenate", and it can be repeated to obtain an infinite lifespan.

The Turritopsis dohrnii is a small jellyfish that lives mostly in tropical waters and feeds on plankton, small crustaceans, polychaetes and even small fish.

The Turritopsis dohrnii jellyfish will still die under normal conditions, and the claim of its "immortality" may just be a false conclusion based on a sloppy scientific experiment.

The dohrnii jellyfish is mainly distributed in the waters of the Caribbean, but by attaching to the bottom of large ships, it gradually spreads to other nearby waters.