Food chains model energy flow through an ecosystem. Producers pump energy into an ecosystem from an environmental source, and this energy is then passed from one organism to the next.
Answer:
Unlike typical mammalian red blood cells, those from amphibians, such as frogs, contain a DNA-bearing nucleus that is visible in the center of the cell. The circulatory system of amphibians is rather unusual, their hearts having three chambers, two atria, and a single ventricle.
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Positive
The design of the amphibian circulatory system is curious because blood accumulates oxygen in the lungs and is then returned to the heart before being pumped into the rest of the circulatory system. Therefore, a mixing between oxygenated and deoxygenated blood occurs as blood returning to the heart from the lungs is mixed with incoming blood from the body. Frogs handle this situation by having a very slow metabolism and by absorbing some oxygen through their skin. In addition, the ventricle does have some directional control over the distribution of the blood.
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The presence of a nucleus in amphibian red blood cells allows researchers easy access to large quantities of amphibian DNA. Frog blood has both a solid and a liquid portion. The liquid plasma carries solid elements such as red and white blood cells. Blood can be collected from frogs and the red blood cells isolated by centrifugation. After removal of the residual plasma, purified cells can be treated with specific enzymes and detergents to digest the cellular envelope and release DNA from its protein complex. The DNA is then useful for scientific studies and experiments.
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Explanation:
Deforestation is the most serious problem facing the world’s forests and the main regions of forest loss are Amazon rain forest.
Deforestation refers back to the decrease in wooded area areas internationally which are misplaced for different uses such as agricultural croplands, urbanization, or mining sports. significantly accelerated by means of human sports due to the fact that 1960, deforestation has been negatively affecting natural ecosystems, biodiversity, and the climate
If forests are cleared, or even disturbed, they release carbon dioxide and different greenhouse gases. forest loss and harm is the cause of around 10% of worldwide warming. there may be definitely no manner we can fight the climate crisis if we do not prevent deforestation.
Forest loss captures essential influences on woodland cover: deforestation and forest degradation. Deforestation is the whole removal of bushes for the conversion of wooded area to every other land use inclusive of agriculture, mining, or cities and towns.
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a - fossil fuels
step by step explanation:
fossil fuels are non-renewable and will run out
Protists are eukaryotes, which means their cells have a nucleus and other membrane-bound organelles. Most, but not all, protists are single-celled.
