Continents like Asia or Africa usually have only one biome.

The production of root hairs is mostly dependent on 

In your biology lab, you are given a vial that contains fish urine. Your assignment is to predict whether the urine came from a fresh- or salt-water species. You discover that the urine contains a high concentration of water and little salt. What is your prediction for the fish’s habitat? What is the concentration of solutes in the fish relative to its environment?

The optimal pH range for most freshwater fishes and invertebrates is

The Intergovernmental Panel on Climate Change reported in 2007 that atmospheric carbon dioxide levels will nearly double by the end of this century (2099). If this happens, what would be the approximate atmospheric concentration of carbon dioxide?

Acid precipitation is known to cause all of the following effects EXCEPT?

Vascular bundles are arranged in an X-shape in _________________ roots.

Most of Siberia, Northern Europe and Canada is in the ______ biome.

What is a feature of woody stems but not of herbaceous stems?

A scientist is studying several natural areas. Her study involves prescribed burns (purposefully set, low-intensity fires) and their effects on species richness over the next ten years. What scale best describes her study?