What is true about main sequence stars? A. They are older than white dwarfs.
B. They are older than red giants.
C. They are all newly born stars.
D. They are middle-aged stars.

the form of energy changes and the total energy increases0l

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answer: collecting information/data

reason: the student is going around and asking people questions to collect data

i hope this

when the displaced particles are perpendicular to the direction the wave travels, is called a transverse wave, whereas in longitudinal wave the displace practices are parallel to the direction of the wave.

in the given image:

first image shows - longitudinal wave

second image shows - transverse wave

third image shows - longitudinal wave

fourth image shows - longitudinal wave

if you add everything up correctly you should get 69 i got this because 50 plus 19 is it