. Describe what an depicts. energy pyramid The relative shape of the pyramid can also vary depending on the ecosystem. Do the primary • producers or the top consumers more greatly impact the shape of the pyramid? Why? C. Essential Chemicals Cycle through Ecosystems What is required to sustain life in an ecosystem? When you boil it down, are two required items: • ____________________ and ________________________ o These include three important molecules that cycle through the ecosystem. 1. 2. 3. Unit 2. Ecosystems and Communities: Organisms and Their Environments Regardless of the molecule’s specific cycle, briefly describe the general pathway a molecule takes as it • moves through the ecosystem. In order to define each of the three important chemical cycles, indicate the following for each cycle: • give an example of how the chemical is utilized, why the chemical is necessary, and indicate the specific reservoirs in which it is found. 1. 2. 3. Humans can disrupt some of these important cycles. Eutrophication occurs when: • IV. Species Interactions Influence the Structure of Communities A. Interacting Species Evolve Together The reproductive success of an organism involves many selective pressures. Does natural selection rely • on biotic forces, abiotic forces, or both? Explain.
. Describe what an energy pyramid depicts. • The relative shape of the pyramid can also vary depending on the ecosystem. Do the primary producers or the top consumers more greatly impact the shape of the pyramid? Why? C. Essential Chemicals Cycle through Ecosystems • What is required to sustain life in an ecosystem? When you boil it down, are two required items: ____________________ and ________________________ o These include three important molecules that cycle through the ecosystem. 1. 2. 3. Unit 2. Ecosystems and Communities: Organisms and Their Environments • Regardless of the molecule’s specific cycle, briefly describe the general pathway a molecule takes as it moves through the ecosystem. • In order to define each of the three important chemical cycles, indicate the following for each cycle: give an example of how the chemical is utilized, why the chemical is necessary, and indicate the specific reservoirs in which it is found. 1. 2. 3. • Humans can disrupt some of these important cycles. Eutrophication occurs when: IV. Species Interactions Influence the Structure of Communities A. Interacting Species Evolve Together • The reproductive success of an organism involves many selective pressures. Does natural selection rely on biotic forces, abiotic forces, or both? Explain.