Question

‘Darwin’s finches’ refers to
(a)Fossil of birds collected by Darwin at Galapagos island
(b)A type of bird presents on Galapagos island
(c)Migratory birds collected by Darwin at Galapagos island
(d)Fossil of reptiles collected by Darwin at Galapagos island

Answer 1

It is a group of about 18 species of passerine birds. They are notable for their exceptional variety in nose structure and capacity. They are often classified because of the subfamily Geospizinae or tribe Geospizini. They belong to the tanager family.

Complete step by step answer:
The expression "Darwin's finches" was first applied by Percy Lowe in 1936, and promoted in 1947 by David Lack in his book Darwin's Finches. Need put together his examination with respect to the massive assortment of exhibition hall examples gathered by the 1905–06 Galapagos undertaking of the California Academy of Sciences, to whom Lack committed his 1947 book. The birds vary in size from 10 to twenty cm and weigh between 8 and 38 grams. The smallest is the warbler-finches and therefore the largest is that of the vegetarian finch. The size and shape of the beaks are the most important differences between species, which are highly adapted to different food sources. The birds are all dull-colored.

So, the correct answer is ‘A type of bird presents on Galapagos island’.

Additional information: On the Galapagos Islands and a while later, Darwin thought as far as "centers of creation" and dismissed thoughts concerning the change of species. From Henslow's teaching, he was curious about the geographical distribution of species, particularly links between species on oceanic islands and on nearby continents. On Chatham Island, he recorded that a mockingbird was practically similar to those he had found in Chile, and subsequent to finding an extraordinary one on Charles Island he painstakingly noted where mockingbirds had been caught. Interestingly, he gave little consideration to the finches.

Note:
Females are dimorphic in song type: songs A and B are quite distinct. Likewise, males with song A have smaller bills than B males. This is also a clear difference. With these beaks, males are ready to feed differently on their favorite cactus, the prickly pear Opuntia. Those with long beaks are ready to punch holes within the cactus fruit and eat the fleshy aril pulp, which surrounds the seeds, whereas those with shorter beaks tear separated the desert plant base and eat the mash and any bug hatchlings and pupae (the two gatherings eat blossoms and buds). This dimorphism unmistakably amplifies their taking care of chances during the non-reproducing season when food is scant.