3个BIOLOGY 问题 急!!!

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 谢谢了 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.

answer in Chinese or English?

1自然选择，兔子的抗病性增强，而且病毒的毒力减弱。因为病毒不会将它们的寄主全部杀死，否则它们也只有死掉了。
2寄生 但兰花并不与树争夺阳光，它们只是靠寄生根吸收植物的营养。
3两个物种可以占据同样的生态位么？这要看环境，如果环境中的资源很丰富，他们之间没有竞争，当然就可以共存了。如果资源是限制因子，那么它们就不可以共存。其实自然界的竞争没咱们想象的大，很多物种之间的竞争都很小。
你找个翻译软件翻译以下吧 。