Why did darwin's contemporaries believe that natural selection could not move a population beyond its initial range of variation?

One statements is an example of a scientific observation. another statement is an example of a scientific explanation. identify the correct statement for each category to illustrate how scientific explanations are inferred from scientific observations.

When water freezes, it . contracts expands

The galapagos island contain 13 species of finches four of the species are seen here it is believed that all of the species had one common ancestor and overtime