Part E In addition to natural factors, human activity can also alter ecosystems. Conduct research on a human
activity that currently affects or can theoretically affect your chosen ecosystem. Use your food web model
to explain how this change can affect the competition for food resources.

What processes take place before the mature mrna exits the nucleus?

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 of the following describes how binary fission and mitosis are similar? a)they are both used for growth or repair b)they both break down membrane-bound nuclei c)both invoke the replication of a single stand of dna d)both replicate genetic material