The elements potassium and rubidium are alkali metals. How do alkali metals differ from other metals?
O A. They have higher densities.
OB. They have higher reactivities.
O c. They have higher melting points.
D. They have higher electronegativities.

What contributes to the high level of biodiversity found in wetlands? a. the large amount of available organic matter to organisms that are food for larger organisms b. the amount of available water for organism use c. the high nutrient availability d. all of the above select the best answer from the choices provided a b c d