European rabbits were introduced to australia in 1859. the rabbits reproduced rapidly in their new environment, displaced other animals and overgrazed vegetation. in an attempt to reduce the rabbit population, a deadly virus was introduced in 1951. when the virus was first introduced, the rabbits died in large numbers, but the death rate decreased over time. what statement best explains the decrease in the rabbit death rate? a) the virus had a short life span and died out with the rabbits. b) natural selection favored rabbits that were resistant to the virus. c) the rabbits died of natural causes and the introduced virus did not work. d) young rabbits exhibited a learned behavior and began to avoid being infected by the virus.

B) Natural selection favored rabbits that were resistant to the virus

Explanation:

Most likely, virus resistance occurred over time, as a consequence of mutation. Individuals that carried the resistance mutation become favourable by natural selection.

Natural selection is evolutionary mechanism which favours traits of an organism that help him survive and reproduce (increase organism's fitness). In the example above, resistant rabbits that survived had the favorable trait (resistance) by natural selection.

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so, relationships are not always worth it. if you are so dependent on them, than in the end they arent worth it because you will realize how unhappy you really were. some people even tend to cut ties with family because they think they cabt make them happy, obly realtionships with a lover can. false. in order to find true happiness, one must learn to love themselves if they want to love someone else. it's unhealthy to be always depend on relationships and to alqays be in and out of one.

so live life, get that job you always wanted, buy those new shoes and love yourself. depend on yourself, not others. they arent worth it, you can make yourself more happier than most people can do to you. it's not woth it. take your time and have fun.