You and a friend decide to spend Saturday afternoon fishing in a nearby lake. Upon arrival, you notice massive algal blooms in the lake and dead fish floating on the surface. A scientist informs you that the cause was an accidental leakage at a biological waste treatment plant located upstream. This is an example of

What are the most explosive events that occur on the sun? umbras solar flares solar winds prominences

This is the process of making a prediction based on the results of prior observations of similar events.

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.