Max read the following text about cloning dinosaurs: (1) Without well-preserved DNA, cloning dinosaurs is all but impossible. (2) However, some scientists claim to have discovered red blood cells, blood vessels, and bone cells from dinosaur fossils. (3) Opponents say that the scientists have found only slime formed by microorganisms that invaded fossilized bones. (4) In response, the scientists continue experimentation, gathering evidence that dinosaur cloning may one day be possible. Which sentence acknowledges a conflicting viewpoint? i am timed so pls hurry