Which observation is evidence of refraction in this photo

The kind of fertilization found in the majority of aquatic animals is (internal or external) fertilization.

Which of the following can be reduced by the use of renewable energy sources? a. social costs b. economic costs c. environmental costs d. all of the above select the best answer from the choices provided a b c d

Which of the following types of stars are dim but can have high surface temperatures? giants main sequence stars supergiants dwarfs