Which two statements describe harmful effects of a tree dying and falling in a forest? a. The space opened in the forest lets more light shine on plants that need it
b. Animals living in the tree's branches lose their shelter and nesting sites
c. The dead tree provides a new source of food for decomposers
d. Vines growing on the tree die if their stems and roots are damaged

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 are they five steps of cloning?

Describe the relationship between isotonic solutions, equilibrium, and water movement into and out of a cell.