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Q. Is pollution always caused by humans?
In the most cases pollution is caused by human activity. Other species and some abiotic factors though can also pollute an ecosystem. For instance, the red tide is created by proliferation of some algae and volcanic dust is a consequence of the internal activity of the planet.
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Explain Angio-edema Angio-edema: Swelling of the mucous membranes, tissues beneath the skin or an internal organ because of an allergic reaction.
Density Dependent Factors - Population Regulation The density dependent factors are intrinsic or biotic factors and they depend on interactions between individuals within same
What are the approaches to the design of retaining walls? The approach to the design of retaining walls can be started as follows: a. Chosse a trial dimension of the wall
what are the excretory organs of birds
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Q. Why pH regulation is important for living beings? How mineral salts participate in this regulation? The prospective of hydrogen (pH) is a measure of the amount of hydrogen i
An ecosystem is a self sufficient interacting system in the biosphere. Eg. forest, desert, pond etc. almost, all the ecosystem have more or less similar fundamental plan for their
Q. What is the nature of the stimulus received and transmitted by the neurons? Neurons transmit and receive chemical stimuli through neurotransmitters released in the synapses.
How do normal flora protect against infection? a. Compete for space and nutrients with pathogens b. Release antimicrobial agents to kill pathogens c. Contribute to host health by p
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