Which group of organisms is classified a population?
a ) a group of skunks living in the same forest
b ) robins in north america
c ) all dogs in china
d ) different kinds of butterflies living in the same patch of rain forest

Fossils of ancestors of the modern horses show a small 4-toed almost dog-like browsing animal named eohippus over time the horses got larger lost toes and changed to a grazing diet what is the best explanation of why this change occurred