Lake malawi, in the african rift valley, is home to more than a hundred species of cichlid fishes, each with slightly different diets and habits. all these species probably evolved from a common ancestor, making them an example of

Which blood cell spend most of their time in the lymphatic system?

What is the most common structure of volcanoes?

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