Natural selection should favor the highest proportion of juxtamedullary nephrons in which of the following species?
a. river otter
b. mouse living in a temperate broadleaf forest
c. mouse living in a desert
d. beaver

How does natural selection change thephenotypes within a population over time?

How is ribosomal rna useful as a molecular clock? a. a large portion of the dna ring is not vital to structure or function, allowing it to accumulate neutral mutations. b. its rate of mutation increases over time as organisms continue to evolve and differentiate from each other. c. a slow mutation rate makes it useful for determining evolutionary relationships between ancient species. d. it is only found in select organisms, making it easier to compare relationships between species that have it.

When the solution concentration on the outside of a cell is greater than thesolution concentrate on the inside of the cell, what type of solution is the cellwithin?