An important challenge to traditional (pre-1860) ideas about species was the observation that seemingly dissimilar organisms, such as hummingbirds, humans, and whales, have similar skeletal structures. this most directly suggested to biologists that
only the best-adapted organisms can survive
advantageous changes can be passed along to offspring
most evolution occurs rapidly following a mass extinction
dissimilar organisms might have evolved from a distant, common ancestor
all of the above

The correct answer will be option- dissimilar organisms might have evolved from a distant, common ancestor

Explanation:

Evolution is a field of biology which studies the history of survival of the organism on Earth or the history of life but not the origin of life on earth. The evolutionary biologists thus collect the evidence in the form of fossils which provides a clue to understanding the survival of species in past times.

Before the concept of natural selection provided by Charles Darwin, Evolutionary Biologists were puzzled with their same skeletal structural specimens collected but of the dissimilar organisms as it lacks the links between these species.

It was the theory of evolution which suggested the mechanism of divergent evolution which solved this puzzle.

Thus, the selected option is the correct answer.