Question

complete the text with the best transitions.

while it may be fun to think about bringing extinct animals like dinosaurs back to life, actually doing so could lead to significant problems for ecosystems and society.
____ even well-intentioned introductions of new organisms can unpredictably disrupt ecosystems, as demonstrated by modern studies on invasive species. ____, the ethical and logistical challenges of reintroducing these animals into modern environments raise serious questions about whether the potential benefits could ever outweigh the risks.

evidence suggests that . . . moreover

research has shown that . . . rather

scientists believe that . . . on the contrary

experts agree that . . . alternatively

Explanation:

1. The first blank needs a phrase that introduces supporting evidence for the claim that reviving extinct species risks disrupting ecosystems, followed by a transition that connects to an additional, related point about ethical/logistical challenges.
2. "Evidence suggests that..." appropriately sets up the supporting example about invasive species.
3. "Moreover" is a transition that signals an additional, complementary point, which fits the shift to discussing ethical and logistical challenges that add to the concerns about reviving extinct species.
4. Other options are incorrect: "Rather" and "On the contrary" signal contrast, which does not fit the flow. "Alternatively" signals a different option, which is also not appropriate here.

Answer:

Evidence suggests that . . . Moreover