Which statement supports the theory of evolution by natural selection?

What is the length x of the side of the triangle below? (hint: use the cosine function)

Imagine you are standing in the antarctic during the southern hemisphere summer. the sky is clear and blue. there are no clouds in the sky. your shadow is cast on the icy ground. what is the color of the shadow?

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.