How are nuclear reactions important to the universe?Justify your answer. pls help this is due in 15 minutes :(

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

If angle "a" is 25°, angle "b" is: a) equal to angle c b) less than angle c c) greater than angle c

If the radius of curvature of the cornea is 0.75 cm when the eye is focusing on an object 36.0 cm from the cornea vertex and the indexes of refraction are as described before, what is the distance from the cornea vertex to the retina? express your answer to two significant