If the frequency of alleles changes in a population over time, then evolution has occurred. 

Your teacher is lecturing on antibiotic resistance. She is talking about

In order for a population to evolve into new species, the following must occur. Choose all statements that are correct.  

The biological species concept states that: 

If gametes (sperm and eggs) from individuals in two different populations move between the populations, genetic changes that occur in one population will spread to the other population as well. Therefore, the two populations cannot become genetically different from one another. This scenario explains why:

A fox who has 12 offspring and dies at age 7 has a higher evolutionary fitness than a fox with 9 offspring who lives to age 10. 

The bones in the forelimbs of vertebrates such as bats, dolphins and humans are:    

Many bacteria are no longer being killed by antibiotics. This is because

Match the event or life form with its closest estimated date of origin.

Match the evidence of evolution with the correct example or definition.