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Science ecology
| Question | Answer |
|---|---|
| what is population | A group of organisms that are all the same species in the same area. |
| two things that increases a population | organisms born and good weather. |
| two things that decreases a population | die of age and predators |
| are humans and dogs part of the same population why or why not | no. because their two different species in the same area. |
| list the three limiting factors | physical, competition, geographic |
| physical | sometimes other environments are just to bad to live in. they may not be too hot, too cold, and or dangerous. |
| competition | you might have a great place to live but there may be other organisms competing for your food. |
| geographic | if your a mouse living in a valley and there are mountains in every direction, are you going to leave your area? probably not. you live a good life and might die if you tried to get over the mountains. an ocean might be another geographic limitation. |
| what is an ecosystem | a complex set of relationships among the living resources, habitats, and residents of an area. |
| what do ecosystems include | plants, animals, trees, fish, birds, micro-organisms, water. soil, and people. |
| what happens if one part of an ecosystem is damaged or destroyed | it would have an impact on everything else. |
| what do all living things need and why | they need energy.. everything we do uses energy, so they can survive. |
| where do animals and plants get energy | animals get energy by eating things and plant get it from the sun, water and nutrients. called photosynthesis. |
| what do links (arrows) in a food chain represents | The arrows represents what organism eats what |
| people are called what because they eat meat and vegetables | Omnivors |
| what are animals called only eat meat | carnivores |
| what are animals called only eat plants | herbivores |
| what are animals called that break down dead matter | decomposers |
| nearly all the what that drives ecosystems ultimately comes from the what. solar energy is an what factor, by the way, enters the ecosystem through the process of photosynthesis. | energy. sun, abiotic |
| why are plants called producers? what are other producers besides plants? | because they make carbon-based molecules, usually carbohydrates. bacteria and Algae. |
| how much energy do consumers obtain when they eat and what happens to the rest? | they obtain 10% and the rest of the 90% is used by the producer for growth. |
| plants pull carbon fro the atmosphere to make food, through a process called what | photosynthesis |
| when plants and animals die and what, carbon goes back into the ground | their bodies wood and leaves decay |
| some carbon is buried deep in the ground and forms what | fossil fuels |
| when humans burn fossil fuels, what is released back into the atmosphere | five and a half billion tons of carbon |
| when humans and animals exhale, they release carbon back into the air by a process called what | respiration |
| 2 ways nitrogen becomes useable to plants, humans, and animals | for protein and DNA, or if there broken apart, or types of bacteria, or by bacteria associated with bean plants |
| how do herbivores obtain the nitrogen they need | by eating plants and other animals that contains nitrogen |
| how is nitrogen returned to the atmosphere | bacteria are able to change the nitrogen and dissolving it into waterways into a form that allows it to return it to the atmosphere. |
| what are two ways humans impact the nitrogen cycle | factories, and power plants |
| how are biomes determined | the world's major communities, classified according to the predominant vegetation and characterized by adaptations of organisms to that particular environment. |
| what are the 6 biomes of the world | tundra, taiga, forest, grasslands, desert, and temperate deciduous forist. |
| what are the freshwater ecosystems | having a low salt concentration, usually less than 1% |
| what are the marine ecosystem | three-fourths of the earth's surface is covered including oceans, coral reefs, and estuaries. supplies much of the world's oxygen supply and takes in a huge amount of atmospheric carbon dioxide. the evaporation of the seawater provides rainwater for the l |
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