[Answer] A population of birds colonizes an area in which the insects upon which they feed live inside trees. Which of the following events accounts for an observed increase in average beak size in the bird population over time?

Answer: Increased fitness of large-beaked birds leading to natural selection
A population of birds colonizes an area in which the insects upon which they feed live inside trees. Which of the following events accounts for an observed increase in average beak size in the bird population over time?

Birds are a group of warm-blooded vertebrates constituting the class Aves / ˈ eɪ v iː z / characterised by feathers toothless beaked jaws the laying of hard-shelled eggs a high metabolic rate a four-chambered heart and a strong yet lightweight skeleton. Birds live worldwide and range in size from the 5.5 cm (2.2 in) bee hummingbird to the 2.8 m (9 ft 2 in) ostrich.

The tawny owl or brown owl (Strix aluco) is a stocky medium-sized owl commonly found in woodlands across much of the Palearctic.The tawny owl is a member of the genus Strix that is also the origin of the family’s name under Linnaean taxonomy. Its underparts are pale with dark streaks and the upperparts are either rufous brown or grey. Several of the eight recognised subspecies have each of …

The footspan of a long-eared owl including claws reaches on average 11.3 and 12.5 cm (4.4 and 4.9 in) in males and females respectively which would be large for a diurnal bird of prey but is quite small for an owl of its size given the physiological differences in the way different birds …

Tool use by animals is a phenomenon in which an animal uses any kind of tool in order to achieve a goal such as acquiring food and water grooming defense communication recreation or construction.Originally thought to be a skill possessed only by humans some tool use requires a sophisticated level of cognition.There is considerable discussion about the definition of what …

Others are very short articles like 9 which has 3 pages or 10 18 (1) 15 (2) 17 (4). Others like 19-20 refer to the work as a whole because it is a publication by the author and pagination is …

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