Fungi often form associations with plants. Some of these are good for the plant and some are bad for the plant. Describe one case of each.

The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.

What do transitional fossils best support?

What is any method of measuring the age of an object or event in years, such as using atomic half-life?