Question

which of the following examples demonstrates natural selection?
a. dark - colored moths becoming prevalent in polluted environments
b. selective breeding of dogs for specific traits
c. farmers selectively breeding cows for higher milk production
d. creating seedless watermelons through cross - pollination

which statement accurately describes the impact of artificial selection?
a. it can produce rapid and extreme changes in traits within populations
b. it operates solely based on environmental pressures
c. it leads to random changes in traits across populations
d. it has no significant effect on the genetic diversity of species

the process of darwins finches adapting to various food sources on the galápagos islands showcases:
a. artificial selection
b. natural selection
c. random selection
d. environmental selection

Explanation:

• First question: Natural selection is a process where organisms better adapted to their environment tend to survive and reproduce. Dark - colored moths becoming prevalent in polluted environments is an example of natural selection as the dark color provides better camouflage (a survival advantage) in polluted areas. Selective breeding (options b, c, d) is artificial selection where humans choose which organisms breed.
• Second question: Artificial selection can produce rapid and extreme changes in traits within populations as humans select for specific traits. It is not based solely on environmental pressures (that's natural selection), it is not random (humans direct it), and it can reduce genetic diversity (as only specific traits are selected for).
• Third question: Darwin's finches adapting to various food sources on the Galápagos Islands is a classic example of natural selection. The finches with beak shapes suitable for the available food sources were more likely to survive and reproduce. Artificial selection is human - directed, random selection is not a recognized biological process in this context, and environmental selection is not a standard term (natural selection is the correct term related to environmental factors influencing survival and reproduction).

Answer:

1. a. Dark - colored moths becoming prevalent in polluted environments
2. a. It can produce rapid and extreme changes in traits within populations
3. b. Natural selection