What is it called when a molecule uses energy to move across a semipermeable membrane?

In this case, the statement that people who exercise for an hour may have lower cholesterol levels is .

Use the phylogenetic tree to the right to determine which statement below is true. organisms a and f are not related. organism e is more closely related to organism b than organism f. organisms c and d are more closely related than organisms a and b. phylogenetic trees

People with one sickle cell allele are not likely to get malaria. what is this an example of?