Scientists and doctors have observed that many species of bacteria are no longer susceptible to antibiotics that were once effective.
Which statement explains why some bacteria species are no longer susceptible to certain antibiotics?
(1 point)
Responses
The bacteria learned to avoid the antibiotics.
The bacteria learned to avoid the antibiotics.
The bacteria modified the antibiotics to make them more effective.
The bacteria modified the antibiotics to make them more effective.
The bacteria that survived the antibiotics passed that resistance to future generations.
The bacteria that survived the antibiotics passed that resistance to future generations.
The bacteria that were susceptible to the antibiotics produced a greater number of offspring.
The bacteria that survived the antibiotics passed that resistance to future generations.
Researchers studying hummingbirds in the Andes Mountains of Ecuador made several observations:
There are many species of hummingbirds.
The species are not separated by any physical barriers.
Unique hummingbird species are found at different elevations in the Andes.
Which hypothesis is based on these observations?
(1 point)
Responses
Conditions at each elevation favor different hummingbird traits.
Conditions at each elevation favor different hummingbird traits.
All hummingbird species are able to interbreed at every elevation.
All hummingbird species are able to interbreed at every elevation.
Elevation changes cause hummingbirds to develop new methods of transportation.
Elevation changes cause hummingbirds to develop new methods of transportation.
Individual hummingbirds choose food sources based on their preferences for specific plants.
Conditions at each elevation favor different hummingbird traits.
The sand goby is a small fish found in Europe's Baltic Sea. During mate selection, females overwhelmingly choose males with large body sizes. In some parts of the Baltic, algae overgrowths are causing the water to become increasingly cloudy. In the cloudy water, females have trouble identifying the larger males.
What can you predict will happen if female sand gobies continue to have difficulty identifying large males during mate selection?
(1 point)
Responses
There will be a change in how often genes for large size occur in the population.
There will be a change in how often genes for large size occur in the population.
There will be an increase in resource competition between large and small males.
There will be an increase in resource competition between large and small males.
There will be an immigration of a new sand goby population from a different habitat.
There will be an immigration of a new sand goby population from a different habitat.
There will be a mutation in the genes for eyesight that will improve vision in the females.