A scientist examines the two animals shown below and concludes that they must have shared a common ancestor at some point. Based on your understanding of homologous structures, determine whether his conclusion is valid. Explain your reasoning.

How can you approximate the number of calories required to keep you in energy balance?

Explain how ancient whale fossils found in eqypt are believed to support the theory of evolution.

Which of the following observation darwin shape his concept of descent with modification? a) species diversity declines farther from the equator. b) fewer species live on islands than on the nearest continents. c) birds live on islands located farther from the mainland than the bird's maximum nonstop flight distance. d) south american temperate plants are more similar to the tropical plants of south america than to the temperate plants of europe. e) earthquakes reshape life by causing mass extinctions.