Final answer:
Different species can indeed interact in interesting ways, including interbreeding, interspecific competition, and various symbiotic relationships. Interspecific competition can lead to exclusion or adaptation, while symbiotic relationships do not necessarily require physical contact. Additionally, the relationship between malaria-causing protists and humans is parasitic, not commensal.
Step-by-step explanation:
True, different species can interact in interesting ways. For instance, there are scenarios where organisms from different species can interbreed, which might make them appear to be a single species; however, they are not closely related. This phenomenon can lead to hybrid species or sometimes to infertility in the offspring.
When considering the outcomes of interspecific competition, two possible results are that one species may outcompete the other for resources, leading to the exclusion of the weaker competitor from the environment, or the species may adapt by utilizing different resources or occupying different niches, which can lead to resource partitioning.
In symbiotic relationships, it is not necessarily true that the two species have to physically touch each other; symbiotic relationships are defined by the close ecological interactions between species, which can include but are not limited to physical contact.
The relationship between the protists that cause human malaria and humans is an example of parasitism, not commensalism, because the protist benefits at the expense of the human host.
Differences in genetic similarities, mating dances of birds, and pollinators of flowers represent diverse methods by which species maintain their distinct identities and avoid the blurring of genetic lines through interbreeding.