What are size of female population of butterfly (Breed once and one year life span ) after two year ?

Nt = 20 (initial population ) Nt+2 =?

Ro=1.5 number of female produced per female per generation

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#Question id: 4569

#Section 2: Evolution

Which of the following must exist in a population before natural selection can act upon that population?

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#Question id: 12324

#Section 1: Ecology

According to the nonequilibrium model,

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#Question id: 12581

#Section 5: Applied Ecology & Evolution

Which of the following causes an increase in the intensity of UV radiation reaching the Earth? 

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#Question id: 12342

#Section 1: Ecology

Which of the following is a biological attribute that would most likely allow a species to become cosmopolitan in distribution?

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#Question id: 16871

#General Aptitude

He is no other ……… my friend.