Question

what are the levels of organization from smallest to largest? what things cause a population to increase in size? what causes the population to decrease? food pyramid what is a trophic level? what percent of stored energy in an organism is passed to the next trophic level? ________ what are the three ecological pyramids and what information do they give? what is the difference between a food chain and food web? symbiosis what is symbiosis? what are the three types of symbiosis? give examples of each.

Explanation:

1. The levels of organization from smallest to largest in biology are: cell, tissue, organ, organ - system, organism, population, community, ecosystem, biosphere.
2. Population size increases due to births and immigration, and decreases due to deaths and emigration.
3. A trophic level is the position an organism occupies in a food chain.
4. Approximately 10% of stored energy in an organism is passed to the next trophic level.
5. The three ecological pyramids are the pyramid of numbers (shows the number of organisms at each trophic level), the pyramid of biomass (shows the total mass of organisms at each trophic level), and the pyramid of energy (shows the amount of energy available at each trophic level).
6. A food - chain is a linear sequence of organisms through which nutrients and energy pass as one organism eats another. A food - web is a complex network of interconnected food - chains.
7. Symbiosis is a close and long - term biological interaction between two different biological organisms. The three types are mutualism (e.g., bees and flowers, where both benefit), commensalism (e.g., barnacles on whales, where one benefits and the other is unaffected), and parasitism (e.g., ticks on dogs, where one benefits and the other is harmed).

Answer:

1. Cell, tissue, organ, organ - system, organism, population, community, ecosystem, biosphere
2. Increases: births, immigration; Decreases: deaths, emigration
3. The position an organism occupies in a food chain
4. 10%
5. Pyramid of numbers: shows number of organisms at each trophic level; Pyramid of biomass: shows total mass of organisms at each trophic level; Pyramid of energy: shows amount of energy available at each trophic level
6. Food - chain is linear; Food - web is a complex network of interconnected food - chains
7. Mutualism (e.g., bees and flowers), Commensalism (e.g., barnacles on whales), Parasitism (e.g., ticks on dogs)