18. The three stars shown below are similar in type and temperature. Qo
Star X
Star Y
Star Z
From Earth, star Y appears to be the brightest while star X and star Z appear to be similar in brightness. Which lists
orders the stars from closest to farthest from Earth?
A. Star X, Star Y, star Z
B. Star X, Star Z, Star Y
C. Star Y, Star X, Star Z
D. Star Y, Star Z, Star X
100%
а
O
B

0

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.

imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.