Role of mycorrhizas in the mineral nutrition of host plants Mycorrhizas are very important in the uptake of nutrients such as P‚ N‚ K‚ Cu‚ Zn and Ca by plants especially in soils low in these nutrients. Since P is the most limiting nutrient in tropical soils‚ mycorrhizas are vital for improving P nutrition particularly for cultivated plants. External hyphae can absorb and translocate P to the host from soil outside the root depletion zone. The thin mycorrhizal hyphae (2-4 μm in diameter) are able
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Human migration Human migration is the movement by people from one place to another with the intention of settling temporarily or permanently in the new location. The movement is typically over long distances and from one country to another‚ but internal migration is also possible. Migration may be individuals‚ family units or in large groups. Immigration is the movement of people into a country to which they are not native in order to settle there‚ especially as permanent residents or future
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Why Dogs are the Most Useful Animal to Humans For as long as anyone can remember dogs have been bred and used to help humans. Whether it be for hunting and gathering‚ companionship‚ to help with the disabled‚ or to help law enforcement officers do their jobs better‚ dogs are the most versatile and useful animals to humans. Most scientists agree that dogs are descended from the Grey Wolf. Dr. Robert K. Wayne of UCLA has shown through DNA research that the Grey Wolf and common dog are so closely
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Humans‚ animals and plants have a great relationship with each other‚ they need each other‚ and they make each other’s lives better. Without plants and animals‚ human won’t be able to survive or can not live till now because humans need plants and animals to feed themselves. On the other hand‚ plants aren’t able to grow‚ too because they need to be taken care by humans. Therefore‚ human should protect both animals and plants. But human couldn’t take good care of animals‚ most of the animals in the
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Part 1 Diseases come from all over the world‚ because of globalization many new diseases have spread around the world. Globalization brought about new measures to systematically to preventing‚ identifying‚ and combating foreign diseases: Surveillance Immunization Research Improved sanitation and living conditions Price of drugs Part 2 Globalization can provide both opportunities and concerns Although globalization can cause concerns‚ it can also have benefits when it comes to dealing with
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lenses. 1665= English Physicist‚ Robert Hooke looked at a silver of cork through a microscope lens and noticed some “pores” or “cells”. 1674= Anton Van Leeuwenhoek built a simple microscope with only one lens to examine blood‚ yeast‚ insects‚ and many other tiny objects. 18th Century= technical innovations improved microscope leading to microscopy becoming popular among scientists. 1830= Jospeh Jackson Lister reduces spherical aberration of the chromatic effect. 1931= Ernst Ruska co-invented
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could be a booming economy‚ favorable immigration laws‚ or free agricultural land in the area to which the migrant is moving. Top 20 Cities Of course every country has its reasons to immigrate‚ but some certain parts or countries are chosen by many immigrants. These are Western Europe‚ Australia‚ the Persian Gulf‚ and North America. Immigrants play a fundamental role in the labor force and the social life of cities. Especially Japan is pulling record numbers of legal and illegal immigrants to
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The domestication of plants and animals lead to great change in the development and structuring of communities‚ as the hunter-gatherer lifestyle was slowly replaced by permanent settlements of farmers and villages. We can see that the communities varied greatly dependent on their local ecology‚ the resources available‚ and the time period within which their community was based. The road to agricultural way of life in the MIddle East is characterized by Four distinct stages. It was during the Kebaran
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Definition Human migration is movement by humans from one place to another‚ sometimes over long distances or in large groups. Historically this movement was nomadic‚ often causing significant conflict with the indigenous population and their displacement or cultural assimilation. Only a few nomadic people have retained this form of lifestyle in modern times. Migration has continued under the form of both voluntary migration within one’s region‚ country‚ or beyond and involuntary migration (which includes
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Many different plant and animal species thrive in the rainforest environment‚ but it is the trees that define the way we see the rainforest. From the air‚ a rainforest looks like an enormous‚ green carpet. The canopy very rarely breaks‚ with no gaps between the trees. Beneath these trees‚ there are thousands of different types of plants. Living amongst the trees‚ vines‚ shrubs‚ ferns‚ and mosses are many different types of animals. These range from the smallest ant to the carnivorous (meat-eating)
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