Which event describes a change where evolution has happened? An allele frequency changes in a population. A white-eyed fly is born into a population of brown-eyed flies. A species of tree dies out. A school of fish moves to a new environment.

A white-eyed fly is born into a population of brown-eyed flies.  

Explanation:

In the example, a new mutation (i.e., white-eyes) has appeared in the progeny. In the case that this new mutation has adaptive value, it will be transmitted across generations and therefore will increase its frequency in the population

complete the square on the right side of the equation;

-5(x + 0)^2 + 15

answer: d. y = -x^2 + 15

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

i hope this : )