Which of the following creates variation within a population? A. mutations and sexual reproduction
B. mutation and asexual reproduction
C. natural selection and sexual reproduction
D. natural selection and variation

Ahypothesis that has been tested again and again , with similar results each time may become a law , true or false

Read the following scenario to answer the following question. in some zoos, rare crosses between a male lion and a female tiger have produced hybrid offspring called "ligers." male ligers are sterile but some female ligers are fertile. in the wild, lion and tiger ranges do not naturally overlap, making such a cross unlikely. furthermore, the solitary behavior of tigers and the social organizations of lions create behavioral differences. applying the biological species concept, the sterility of ligers reveals that a. lions are probably a subspecies of tigers b. tigers and lions are the same species c. a new species called "ligers" is forming d. tigers and lions are separate species

What is the problem in this article? what solution does the article propose?