The term aquatic is related to water which is the most important chemical compound that enables the existence of living organisms on Earth. Circulating in the solid (ice), liquid, and gaseous (vapor) states, water supports the activities of living organisms on Earth. It is a transparent, tasteless, odorless and nearly colorless chemical substance, which is the main constituent of Earth’s hydrosphere and the fluids of most living organisms. It is vital for all known forms of life, even though it provides no calories or organic nutrients. Its chemical formula is H2O
A call organisms living in hydrosphere as aquatic organisms, most of the organisms on Earth can be regarded as aquatic organisms.
In the early days of the Solar System after its birth, gases and dust clumped together and formed the micro-planets. The Earth was born from the fusion of these micro-planets. The heat released during this process created the ocean of magma on the Earth, while the gases from the magma, of which, vapor, carbon dioxide, and nitrogen were the main components, formed the hot atmosphere on the Earth. With a decrease in the temperature of the Earth, the dense clouds covered the upper layer of the atmosphere leading to rain. The rain falling on the hot magma produced vapor in the lower layer of the atmosphere. This process repeated over and over again for a long period. After the fusion of the micro-planets subsided, the temperature decreased gradually and the solid crust of the Earth was formed. This is a generally accepted theory on the early history of the Earth.
Aquatic plants are plants that have adapted to living in aquatic environments i.e. Saltwater or freshwater. They are also referred to as plants growing in or near water to distinguish them from algae and others. In lakes and rivers plants growing to provide cover for fish, a substrate for aquatic invertebrates, produce oxygen and act as food for some fish and wildlife.
The Earth was called the planet of water. When we see the picture of the Earth floating in the real black cosmos, the Earth is totally bluish even inland parts just like its name. In fact, 75% of the Earth’s surface is covered with water when we include the ice-covered areas. Water is indispensable for living organisms. Life originated in water and all living organisms are dependent on it. Among the planets of the Solar System, liquid water exists only on the Earth. The distance between the Earth and the Sun enables the existence of liquid water on the Earth. Venus, moving on an inner orbit around the Sun than the Earth, receives much higher solar energy than the Earth, and the heat is trapped by its atmosphere as the greenhouse effect.
Some examples of Aquatic Plants are –
- White Lotus
- Yellow Skunk Cabbage
- Victoria Amazonica
- Water Cabbage
Aquatic animals are those animals that live in either freshwater or saltwater for all its lifetime. They can live predominantly in different water forms, such as seas, oceans, rivers, lakes, ponds, etc.
There are more different types of fish than the number of amphibians, birds, mammals, and reptiles combined. Fish are aquatic animals because they live all of their lives in water. Fish are cold-blooded, and they have gills that take in oxygen from the water to breathe. In addition, fish are vertebrates, which means that they have a backbone. Think about your back and the column of vertebrae, or disks in the back, that run down the center. Mammals can be found on land and in water Vertebrates have lungs give birth to their babies.
Some examples of Aquatic Animals are-
- Sea Otters
Here is the description about aquatic animals and plants .