3-3 Section Assessment Biology 10th

1. Unlike the one-way flow of energy, matter is recycled within and between ecosystems.
2. To build tissues and carry out life functions.
3. Atmosferic nitrogen (gas) is fixated by bacteria, lightning, volcanic eruption, and very high temperatures (fertilizer). Through fixation is transformed mainly into ammonia and nitrates, forms that are used by the plants (uptake by producers) . Ammonia a nitrates pass to the animal through consumption of plant an they form part of carbon compounds (and tissues) such as protein, and nucleic acids. Through excretion the animals release ammonia nitrogen which can be reused by the producers.When the animals died, decomposer return nitrogen to the soil as ammonia.
4. If a nutrient is in short supply, it will limit an organism's growth.
5. If vast areas of forest were cleared, less carbon dioxide would be removed from the atmosphere by plants.
6. When an aquatic ecosystem receives a large input of a limiting nutrient, the result is often an algal bloom. algal bloom can sometimes disrupt the equilibrium of an ecosystem by producing more algae than consumers can eat.