Why would a scientist make a new hypotheses after all this work?

Which is mostly likely why many scientists reject the cold fusion theory

The ph of carrots are 5.0 how it is classified a.acidic b.basic c.indicator d.neutral

The diagram shows the structures of horse and cat forelimbs. what does the diagram suggest about the evolutionary relationship between these two mammals? a. they have homologous structures, indicating a common ancestor. b. they have analogous structures, indicating a common ancestor. c. they have homologous structures, indicating that they do not have a common ancestor. d. they have analogous structures, indicating that they do not have a common ancestor.