Why does the modern model of the atom use an electron cloud? A Electron location is visualized as a 95% probability. B Electrons produce a gas around the nucleus. C Electrons block sunlight and this act like a cloud.

Ture or false evidence for evolution includes millions of fossils

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.

What happens to the amount of waste in the pond as the ecosystem ages?