A biologist studied a population of squirrels for 15 years. During that time, the population was never fewer than 30 squirrels and never more than 45. Her data showed that over half of the squirrels born did not survive to reproduce, because of competition for food and predation. In a single generation, 90% of the squirrels that were born lived to reproduce, and the population increased to 80. Which inference(s) about this population might be true?

A) The amount of available food may have increased.

B) The number of predators may have decreased.

C) The squirrels of subsequent generations should show greater levels of genetic variation than previous generations, because squirrels that would not have survived in the past will now survive.

Choose correct combination,

TLS Online TPP Program

#Question id: 12327

#Section 1: Ecology

Which  of  the  following  is  the  most  accepted hypothesis as  to  why  invasive  species  take  over  communities into which they have been introduced?

TLS Online TPP Program

#Question id: 4656

#Section 2: Evolution

Logically, which of these should cast the most doubt on the relationships depicted by an evolutionary tree?

TLS Online TPP Program

#Question id: 3321

#Section 2: Evolution

When an allele at one locus spreads by natural selection acting on a second locus knows as

TLS Online TPP Program

#Question id: 10585

#Section 1: Ecology

Per capita birth rate of this population is b and per capita death rate of population is d, N is a population size. What is yield of population per unit time as?

TLS Online TPP Program

#Question id: 12690

#General Aptitude

From four corners of a square sheet of side 4 cm, four pieces,each in the shape of arc of a circle with radius 2 cm, are cut out.The area of the remaining portion is :