Answer:
1. Earth's temperature is maintained by re radiated infra red radiation by green green house gases and slightly by water vapors in atmosphere. These gases prevent heat from escaping to outer space, so are functionally comparable to glass panel of green house. Thus, this heating effect is referred to as green house effect. Carbon dioxide is a green house gas so increased amount of this gas in the atmosphere will result in increased atmospheric temperature and global warming.
2. Three sources of atmospheric carbon dioxide are:
- Volcanic eruption
- Respiration by plants and animals
- Decomposition of organic substance.
Explanation:
- <u>Overall rise in temperature </u>of the Earth due to excessive amount of green house gases in atmosphere that trap heat radiating from Earth's surface is called Global warming.
- Global warming can cause melting of ice caps, alteration of seasons, destruction of forest and increase in deserts.
- Green house gases include carbon dioxide, methane, ozone, nitrous oxide, and nitrogen dioxide etc.
- Among all these gases Carbon dioxide is the major component that is responsible for global warming.
- Carbon dioxide is added to the atmosphere by burning of fossil fuels, volcanic eruption and respiration. But Burning of fossil fuels itself adds about 18 X 10¹² tonnes of CO₂ anually.
- Global warming has become a major environmental concern now and needs to be controlled immediately.
<span>The possible effect of muscle fatigue is being experienced when muscles are unable to generate force.
This occurs when muscle ATP is being in the process of metabolism of biomolecules. For example sugar and fats.
ATP generates muscle contraction. Muscle fatigue occurs when ATP is being depleted and results in strenuous exercise.
There is also lactic acid accumulation and oxygen depletion.</span>
Biodiversity ensures that there is a wide range genetic variations in certain species and many different species in an ecosystem. If an epidemic breaks out in a ecosystem if one species has some organisms that are immune to that disease they will survive and pass on the gene that makes them immune. If one species completely dies out in that ecosystem another species may be able to take over its role in the ecosystem so the whole ecosystem does not die out. If a certain species has a characteristic that helps them blend in with their environment and protects them from their predators those members of the species will survive and pass on their genes to later members of their species. If a invasive species is introduced it would be helpful if their was an animal in that ecosystem that could help regulate the invasive species population however what is most likely to happen is that due to the high stability of the ecosystem due to a high biodiversity the ecosystem will have a better chance of surviving because their will be different sources of food in the environment so the invasive species and the native species wouldn't have to compete too much for food.
Nutrients are brought to spongy bone by diffusion through canaliculi
- Diffusion through the canaliculi
<h3>How is bone tissue nourished?</h3>
Nutrition is provided by the so-called Nourishing Foramina, which are openings in the bone through which blood vessels, veins and arteries pass. Also with regard to nutrition, Volkmann's canals provide the main entry route for vessels to cross compact bone.
With this information, we can conclude that Volkmann canals also contain nutritional vessels arising from the periosteal and endosteal bone surface.
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