Which of the following is true concerning sources of water pollution?
a.
mine wastes and heavy metals become water pollution through storm water runoff.
b.
biodegradable materials like food, wood, and leaves are not considered pollution.
c.
petroleum byproducts and fuels end up as pollution principally from oil spills.
d.
pesticides and herbicides do not commonly become water pollutants.

(it's not b)

Explain how the political influence of african americans leaders became weaker.

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.

Which statement is not an accurate description of meiosis? a) meiosis produces offspring that are genetically diverse. b) meiosis produces offspring that are identical to the parent. c) in sexual reproduction half of the genetic material comes from the father (sperm) and half of the genetic material comes from the mother (egg). d) meiosis decreases the number of chromosomes by half so that when a sperm fertilizes an egg, the resulting zygote has the correct number of chromosomes.