Which statement from the text supports the author's opinion that modern man is physically different from the neanderthals?
a. both species were forced to retreat as the ice caps moved causing the big game they lived on to move south.
b. knowing that our ancestors arrived in europe about 45,000 years ago and co-existed with the neanderthal species until 28,000 years ago has generated many questions.
c. this [dna study] contributed to the theory that there were distinct differences between the two species.
d. other theories include the ideas that humans had superior communication and social organization skills, or that humans had better hunting techniques.
