Final answer:
Anemones are equipped with tentacles that bear cnidocytes, containing nematocysts for protection and immobilizing prey, which are also used in territorial disputes. These features allow them to maintain personal space and defend their territory, which is necessary for survival despite potential energy costs.
Step-by-step explanation:
Anemones have specialized features that enable them to engage in attacks and defend themselves. One key feature is their tentacles, which are equipped with cnidocytes. Cnidocytes contain nematocysts, which are stinging cells that can immobilize prey with toxins. These same stinging cells are used in conflicts with other anemones, as they can deliver harmful stings to their opponents. When referring to sea anemone competitions, these creatures are exhibiting aggressive behavior to guard their territory or resources. The nematocysts are crucial for both prey capture and protection, as they inject poison into other organisms that come too close.
The need for ample space among sea anemones could be surprising given their size; however, this requirement makes sense when considering their territorial nature. The tentacles give anemones a larger area of influence, and with it, a need to ensure a certain range of 'personal space' to effectively capture prey and avoid competition. Regarding the costs in energy of anemone fighting, it must be economical enough to justify the defense of territory. Otherwise, the energy expenditure could outweigh the benefits, potentially leading to a decline in the anemone population.