Final answer:
The statement that selection can act only on the level of the individual is false. Natural selection mainly acts on individuals and their genetic contributions to the next generation. However, other forms of selection such as kin selection and artificial selection also occur at different levels, including genes and groups.
Step-by-step explanation:
The statement "Selection can act only on the level of the individual; nothing on a larger scale and nothing on a smaller scale?" is false. Natural selection does indeed act at the level of the individual; it selects individuals with greater contributions to the gene pool of the next generation, a concept known as an organism's evolutionary (Darwinian) fitness. However, selection can also act on different levels, such as at the gene level (kin selection and selfish genes) and on larger scales like groups or even species (group selection).
For example, kin selection is a form of natural selection that favors the reproductive success of an organism's relatives, even at a cost to the organism's own survival and reproduction. Group selection, though more controversial among biologists, proposes that altruistic groups can prevail over less cooperative ones, thus leading to a situation where selection might act at the group level.
Furthermore, artificial selection, which is the intentional reproduction of individuals in a population that have desirable traits, is another form of selection acting on the individual level but is driven by human choice rather than natural environmental pressures.