The chart above shows the allele frequencies for a normal hemoglobin (a allele) and a sickle cell hemoglobin (s allele). which can correctly be inferred from the chart when looking at the allele frequency changes that have occurred over the three generations?

Which of the following is not a defining characteristic of plants?

Name the organism that belongs to the kingdom protista.

1. in what ways have non-native species been beneficial? 2. what are some of the hypotheses for the collapse of honeybee colonies? 3. distinguish between regional and functional extinction. 4. why is it difficult to measure background extinction rates? 5. what three factors are most important in causing extinction rates to climb?