Final answer:
Symbiosis is a close relationship between different species in which at least one species benefits. There are three types of symbiotic relationships: mutualism, commensalism, and parasitism.
Step-by-step explanation:
Symbiosis is a close relationship between two organisms of different species in which at least one of the organisms benefits. There are three types of symbiotic relationships: mutualism, commensalism, and parasitism.
Mutualism is a symbiotic relationship in which both species benefit. An example of mutualism is the relationship between bees and flowers, where bees get nectar from flowers and in return, they help pollinate the flowers.
Commensalism is a symbiotic relationship in which one species benefits and the other is not affected. An example of commensalism is the relationship between cattle and cattle egrets, where cattle stir up insects as they move, providing food for the egrets without harming the cattle.
The true statement about symbiosis is that all mutualisms are symbioses, recognizing that there are three main types of symbiotic relationships: mutualism, commensalism, and parasitism.
The statement about symbiosis that is true is: 3) All mutualisms are symbioses. Symbiosis is a broad category that describes a close, long-term interaction between different species. Within symbiosis, there are three main types: mutualism, where both species benefit; commensalism, where one species benefits and the other is not significantly affected; and parasitism, where one species benefits at the expense of the other. Therefore, not all symbiotic relationships are mutualistic, as option 4 suggests, and not all symbioses are limited to mutualisms and commensalisms, as option 2 incorrectly implies. Option 1, which states that all mutualisms and commensalisms are cases of facilitation, also does not appropriately capture the range of symbiotic interactions.