The cassowary is a frugivore. It's also a flightless bird just smaller than ostriches and emus. Many plants will no longer germinate unless their seeds have passed through the cassowary's digestive tract. A. Dominant B. Keystone C. Neither D. Flightless bird or dinosaur, you be the judge {Ans: B}Why do organisms need nitrogen? A. It's part of nucleotides B. It's part of amino acids C. It's a constituent of most carbohydrates D. Lipids are rich in nitrogen {Ans: A&B}According to the competitive exclusion principle, two species cannot continue to occupy the same. Select one: A. habitat. B. niche. C. territory. D. range. E. biome. {Ans: B}Proteins in your body are made of amino acids. Every one has a nitrogen in it. Where does it come from? A. The air B. Big factories C. Bacteria D. Plants E. All of the above {Ans: E}You are largely made of oxygen, carbon, hydrogen, and nitrogen (that's 96% of your body). Where does the carbon come from ultimately? A. Diamonds, they are a girl's best friend after all B. CO2 C. Our diet D. The citric acid cycle (krebs) E. Carbon rich fossil fuels {Ans: B&C}White-breasted nuthatches and Downy