Final answer:
The leafcutter ant and the fungi they cultivate have a mutualistic relationship, but streptococcus is not part of this interaction; therefore, the statement is false.
Step-by-step explanation:
The statement that the leafcutter ant, the fungus they garden, and streptococcus have a mutualistic relationship is false. Leafcutter ants do have a mutualistic relationship with certain fungi they cultivate: the ants provide the fungi with leaf matter to decompose, and in turn, the ants feed on the fungi. This relationship is beneficial to both the ants and the fungi, as the ants can't digest cellulose on their own, and the fungi receive a constant supply of leaves and protection from competing organisms. However, streptococcus, a type of bacterium, is not involved in this particular mutualistic relationship. Thus the components of this mutualistic relationship described in the question include just the leafcutter ants and the fungi they cultivate, not streptococcus.