What's another way to say on the other hand?

Which statement best describes the intended aesthetic impact of this excerpt?

Which statement contains an opinion? the ants serve to protect the acacia from other plants and herbivores. the acacia depends on pollinators for the exchange of genetic material. the acacia has no chemical defenses to discourage herbivores. the ants provide the acacia with the best protection from other plants and herbivores.

Your school has recently decided to start serving genetically modified food as part of school lunches. give a multimedia presentation to the student council arguing for or against the new policy. include engaging visual elements and strong evidence that support your position.