hands down the most important organism on this planet is marine algae.” Phytoplankton are tiny microscopic plants – algae – that form the base of the marine food chain. Phytoplankton is most abundant in colder waters where there is an abundance of nutrients.

The basic needs of living things

• Sunlight: This is probably the most important need for all living organisms because it is the source of all energy.
• Water: Water is the medium in which living cells and tissue work.
• Air:
• Food (nutrients):

Interactions. Living organisms within an ecosystem interact in many ways including predation, cooperation, competition and symbiosis. Each species has a niche, or special role, such as eating small insects, decomposing matter or converting sunlight to energy through photosynthesis.

Ecosystem services are indispensable to the wellbeing of all people, everywhere in the world. From the availability of adequate food and water, to disease regulation of vectors, pests, and pathogens, human health and well-being depends on these services and conditions from the natural environment.

The living organisms in an ecosystem can be divided into three categories: producers, consumers and decomposers. They are all important parts of an ecosystem.

Pond Ecosystem

• frogs.
• fishes.
• birds.
• snakes.
• insects.
• turtles.
• microscopic organisms.

Examples of ecosystems are: agroecosystem, aquatic ecosystem, coral reef, desert, forest, human ecosystem, littoral zone, marine ecosystem, prairie, rainforest, savanna, steppe, taiga, tundra, urban ecosystem and others. plants, animals, soil organisms and climatic conditions.

The World Ocean

We depend on resources such as sunlight, soil, water, and air for our survival, and we also depend on other species. Humans tend to change the ecosystems they live in. For example, most of southern Ontario used to be forested land. Like all organisms, humans compete with other species for basic needs in an ecosystem.

You Are an Ecosystem The human body is also an ecosystem. There are trillions tiny organisms living in and on it. These organisms are known as microbes and include bacteria, viruses, and fungi.

An artificial ecosystem is a human made system of plants, animals, and people living in an area together with their surroundings. Zoo parks often create artificial ecosystems by placing animals in human-made areas similar to their natural habitat.

An ecosystem, which is created and maintained by human beings, is called artificial or man- made ecosystem. Some examples of man- made ecosystem are aquarium, garden, agriculture, apiary, poultry, piggery etc.

Garden and pond are man-made ecosystems.

Some of the major important characteristics of artificial ecosystem are as follows:

• Diversity will be lesser compared to natural systems.
• Whereas the natural systems do not have definite goals and evolved by trial and error and their survival value, the artificial ecosystem is pragmatic with well defined goals.

Because usually man is interested in only a few economically beneficial species only and only those species will be used by man to create an ecosystem e.g., agriculture field is a man made artificial ecosystem having only those plants which are economically beneficial. Thus, the correct answer is option A.

Bridge, roads, buildings, and monuments are four examples of human made environment.

The definition of man made refers to something that was created by humans, as opposed to by God or nature. An example of man made is a lake that was dug by a company using machines. An example of man made is an artificial fiber used to make a piece of fabric.