作业帮3个BIOLOGY 1.To control its wild rabbit population,the Austra
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3个BIOLOGY
1.To control its wild rabbit population,the Australian government introduced the viral disease myxomatiosis.At first the virus was very deadly to the rabbits but eventually the rabbit population stabilized.Explain what happened to the rabbit population and why the virus became less virlent.
2.Some species of orchids grow high in the trees of tropical forests.The trees provide the orchids with the support to grow and allow them to capture more sunlight than they would on the forest floor.What form of symbiosis is illustrated by this occurrence?Explain your answer.
3.Can two species occupy the same niche?Explain.
这回是期末考啊..大哥大姐们帮帮忙啊...T_T 只要回答两题就够了
答案要英文的...
1.To control its wild rabbit population,the Australian government introduced the viral disease myxomatiosis.At first the virus was very deadly to the rabbits but eventually the rabbit population stabilized.Explain what happened to the rabbit population and why the virus became less virlent.
2.Some species of orchids grow high in the trees of tropical forests.The trees provide the orchids with the support to grow and allow them to capture more sunlight than they would on the forest floor.What form of symbiosis is illustrated by this occurrence?Explain your answer.
3.Can two species occupy the same niche?Explain.
这回是期末考啊..大哥大姐们帮帮忙啊...T_T 只要回答两题就够了
答案要英文的...
1 There are two reasons.The first one is natural choice.The virus picked out the rabbits with a strong resistance.The percentage of "strong" rabbit increased.The second one is immuse of the rabbit is strenghened.
2 Parasitic but not with the orchid tree for sunlight, they only rely on the parasitic plant roots absorb nutrients.
3 Two species can occupy the same niche .This depends on the environment, if the environment is very rich in resources, not competition between them, of course, can coexist on the same environment. If resources are limiting factors, then they can not coexist. In fact, the competitive nature did not Let's imagine, a lot of competition between the species are very small.
2 Parasitic but not with the orchid tree for sunlight, they only rely on the parasitic plant roots absorb nutrients.
3 Two species can occupy the same niche .This depends on the environment, if the environment is very rich in resources, not competition between them, of course, can coexist on the same environment. If resources are limiting factors, then they can not coexist. In fact, the competitive nature did not Let's imagine, a lot of competition between the species are very small.
The chinese government is .to the control of population grow
China has (taken some measures )to control the population
Though laws have been passed to control the population growt
The world population is e_____;every country has to control
some people think it impossible to control the population gr
The rabbit took a watch( )its pocket.
118.Greater efforts to control the population must be made i
以how to control the population为题写一篇英语作文
求以Do we need to control the population growth 英语作文
If we don't take action to control the population growth,peo
Greater efforts to control the population must be made if fo
and the extinction of one species' wild population can have