These can include relationships, such as those that exist in the intestines of humans. Here, E. coli flourishes on oxygen provided by humans, so in that sense, are unaffected, while are benefited. These can also include relationships, such as those that exist with root nodules of legumes. Here, bacteria into a form usable by plants and plant nodules provide a habitat for the bacteria. Bacteria also obtain energy from this process. In this sense, both bacteria and plants . These can also include relationships, such as those that cause disease in humans. Here, bacteria can produce to resist human immunity and to cause disease; in this sense, benefit, while are harmed.

Symbiotic interactions are those establisled from the interaction between different species. 1) symbiotic. 2) commensalistic, human, bacteria. 3) mutualistic, fix nitrogen, benefit. 4) Parasitic, endospores, toxins, bacteria, human.

What is a symbiotic relationship?

Symbiotic interactions refers to the relationship between two or more organisms of different species in which at least one of them is beneficiated.

These species create permanent mutual dependence

What are the different types of symbiosis?

Amensalism refers to a biological relationship established between two organisms, in which one of them avoids the growth, development, or survival of the other one.

In this interaction, one of the organisms seems to be strongly affected by the other one. Meanwhile, the other organism does not seem to be affected at all.

Commensalism, in which the fitness of only one of the involved species increases, while the other species is not affected at all.

This relationship does not affect the other species nor positively or negatively. The unaffected species might provide food or refuge to the other species, which is the beneficiary.

Parasitism. In this case, one of the species is the beneficiary, while the other suffers a consequence, reducing its fitness.

These interactions are mainly about nutrition, although there might be other benefits too.

Some parasite species might coexist with their host, while some others might get them ill to the point of causing death.

Mutualism. The interaction is favorable for both species. Their fitness increases with these interactions, although they do not need this relationship to survive. The degree of benefits might vary among species or might be equal.

According to this framework,

Intimate relationship between different species are called symbiotic relationships.

These can include __commensalistic__ relationships, such as those that exist in the intestines of humans. Here, E. coli flourishes on oxygen provided by humans, so in that sense, __humans_ are unaffected, while __bacteria__ are benefited.

These can also include __mutualistic__ relationships, such as those that exist with root nodules of legumes. Here, bacteria ___fix nitrogen__ into a form usable by plants and plant nodules provide a habitat for the bacteria. Bacteria also obtain energy from this process. In this sense, both bacteria and plants ___benefit_ .

These can also include __parasitic__ relationships, such as those that cause disease in humans. Here, bacteria can produce _endospores__ to resist human immunity and __toxins__ to cause disease; in this sense, __bacteria__ benefit, while ___humans__ are harmed.

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