Is this in the correct order? Where do I put the lables given at?

(please help me quickly)

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

Crossing over and independent assortment are important activities that occur during meiosis. what is the significance of these activities

The relationship between intron and exon