A layer of water just under a frog’s skin captures oxygen from air or water and delivers it to blood vessels at the skin’s surface. How might this function relate to the fact that frogs are very sensitive to environmental pollution?

Which statement about conducting formal research is false? you should avoid electronic sources such as databases and websites. you should use short sentences and abbreviations to take notes. you should gather information from several different sources. you should use note cards and source cards to keep track of your sources.