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,

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#Question id: 7547

#General Aptitude

In a toy, two men with red and blue caps are moving in two different circular paths of same radii. When the man with red cap moves 3 steps, the one with blue cap moves 5 steps in the same time, but the distance traversed by the man with red cap in 5 steps, is equal to the distance traversed by the man with blue cap in 4 steps. What is the number of rounds the man with red cap made the man with blue cap completed 100 rounds?

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#Question id: 5309

#Unit 11. Evolution and Behavior

A sequence database such as GenBank could be used to carry out which of the following processes? 

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#Question id: 11953

#Unit 7. System Physiology – Animal

Which of the following is a difference between vitamins and minerals?

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#Question id: 11604

#Unit 6. System Physiology – Plant

What will be the effect of exogenous gibberellin in plant?

a) extreme stem elongation in dwarf plants

b) Increases  in stem thickness

c) decrease in leaf size

d) decreases in stem thickness

e) Increases in leaf size

f) pale green color of the leaves

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#Question id: 853

#Unit 1. Molecules and their Interaction Relevant to Biology

In the presence of a large excess of _______ the disulfides (cystines) are fully converted into sulfhydryls (cysteines).