LS4B - Natural Selection

What is the main idea behind natural selection?

• All organisms in a population reproduce at the same rate.

• Organisms change their traits to adapt to their environment.

• Individuals with traits best suited to their environment are more likely to survive and reproduce.

• Humans choose which organisms get to reproduce.

During the Industrial Revolution, how did the population of peppered moths change in areas with heavy pollution?

• The number of light-colored moths increased.

• The number of dark-colored moths increased.

• Both light and dark moths disappeared.

• Moths learned to change their color to match the trees.

What two main conditions are necessary for natural selection to occur?

• A stable environment and a large population.

• Genetic variation within a population and a selection process.

• Organisms that can change their traits and a lack of predators.

• Only one type of organism and a changing climate.

How does the use of antibiotics lead to an increase in antibiotic-resistant bacteria?

• Antibiotics cause bacteria to develop new resistance traits.

• Antibiotics make all bacteria stronger and more resistant.

• Antibiotics kill bacteria with low resistance, allowing resistant bacteria to reproduce more.

• Bacteria learn to avoid antibiotics over time.