Facultative

Facultative - this term is used to describe organisms that are not limited to any one mode of existence. Thus, a facultative parasite can either parasitize in someone’s body, or, under various conditions, lead a non-parasitic lifestyle, existing outside the body of its host. For comparison: obligate.

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The term “facultative” is used in biology to describe organisms that are not limited to any single mode of existence and can exist in one or another state. This can be either a positive or negative property of the body, depending on its purpose.

One example of a facultative organism is a facultative parasite, which can parasitize the body of its host, but under certain conditions can exist without it. Facultative parasites can be more dangerous than obligate parasites because they can live in different environments and be more adaptive to their environment.

Facultativeness can also be used to describe organisms that can use different food sources or live in different environments. For example, some insects can feed on both plants and other insects.

In general, facultativeness is an important property of organisms that allows them to survive in different conditions. However, this property can also be negative if the organism becomes more dangerous to the environment or its owner.

Good day, dear readers! Today I would like to tell you about such an important concept in biology as facultative organisms. You may already be familiar with this term, but if not, then let's figure out what it is.

Facultative (from Latin facultas - strength, power) is a term proposed by Ernst Haeckel and used to designate organisms of a certain category that freely make a choice (agreed in advance and determined) between two or more possibilities of existence corresponding to the possibility of reproduction of these organisms. Each specific representative of this category chooses the existence that suits him.