Why do rocks have different color stripes

What does the cell nucleus do or, how does it function?

The twister and runaway train are two coasters at the same amusement park. both coasters start at the same height. the coaster for the twister is twice the mass of the coaster for the runaway train. which roller coaster has greater gravitational potential energy at the start of the ride?

Take a look at this dandelion. the yellow flower on the right is pollinated and the seeds on the left are transported by