1. the presence of parasites in an animal will usually result in
A.an increase in meiotic activity within structures of the host
B.the inability of the host to maintain homeostasis
C.the death of the host organism within twenty four hours
D.an increase in genetic mutation rate in the host organism
2. a particular species of unicellular organism inhabits the intestines of termites, where the unicellular organisms are protected from predators. Wood that is ingested by the termites is digested by the unicellular organism, forming food for the termites. the relationship between these two species can be described as
A.harmful to both species
B.parasite / host
C.beneficial to both species
D.predator / prey
3.in a certain ecosystem, rattlesnakes are predators of prairie dogs. if the prairie dog population started to increase, how would the ecosystem most likely ragain stability?
A.the rattlesnake population would start to decrease.
B.the rattlesnake population would start to increase.
C.the prairie dog population would increase rapidly.
D.the prairie dog population would begin to prey on the rattlesnakes.
4.the size of a mouse population in a natural ecoystem tends to remain relatively constant to
A.the carrying capacity of the environment
B.the lack of natural predators
C.the cycling of energy
D.increase numbers of decomposers
请帮忙做一下,以上都是一些简单的选择题.
1.___ 2.___ 3.___ 4.___
答案后面请加以说明为什么选这个答案(可以用中文解释).谢谢!!!!!!!
做的一题得一题,做你们认为答案肯定的那个.
还有,请不要将以上的问题翻译了就给我.上面的问题我已经知道意思是什么了,所以你们不要直接将他翻译了就给我,谢谢