1.

is this statement true or false?

stars are classified mainly according to their distance from earth.

a. true

b. false

2.

the brightness of a star depends on the amount of light energy coming from the star. which of the following also affects the brightness of a star in the sky?

a. how much light is shining on the star.

b. how far the star is from earth.

c. the season of the year on earth.

d. how many other separate stars you see around it.

How does a gymnosperm prevent itself from pollinating the same tree

Sally and sue were investigating the topic of friction in science. they used a small car and a ramp as seen in the picture to test what they were learning. they knew that they slipped easily on waxed floors but not on carpet, so they decided to change the material on the surface of the ramp to see what happened. they planned to use glass, carpet, aluminum foil, and sandpaper and run the car down the ramp over each surface. what would be the best research question to guide the girls' experiment? a) does the amount of surface area affect the friction on the moving car? b) will the car travel fastest on the glass surface? c) how does the angle of the ramp affect the speed of the car? d)do rougher surfaces tend to create more friction than smooth surfaces?

What is the identity of the planets?