Since Darwin published on the Origins of Species, scientists have pursued different areas of research to test his theory of natural
selection. Researchers have found that different penguin species
have similar DNA sequences, also called
Choose...
which supports
+
Darwin's ideas about a common ancestor. Other scientists have
compared the structures of the wings of penguins to the structures
of the wings of other species of birds, such as seagulls. The wings
of penguins and the wings of seagulls are
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because they are
+
similar in structure and derived from a common ancestor but have
evolved to fulfill different purposes. The penguin's wings are also an
example of Choose...
because
penguins can no longer use them to fly. Scientists studying
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have hypothesized that
the Galapagos penguin evolved from Humboldt penguins that were
carried from Chile and Peru by ocean currents.

the correct answer is - d. china has a large and growing population.

the fact that china has a large (the biggest) population, and it is still growing, doesn't hinder the agriculture production in the country. in fact, it can for increased production in the agriculture, since there's more labor force, as well the sheer mass of people produces lots of scientists that come up with new inventions as to how to improve this sector. nice example is the inner mongolia region in china, in general dominated by the gobi desert, but few scientist came up with a nice idea as to how to make the region productive by using plants that are very resistant to droughts, so lots of people have been employed, and the region is becoming greener and greener each year, and the production of food in this region is also increasing.

the two answers are a, the population of birds with large beaks will increase on the island, and c, the trait for large beaks will be passed on to future generations through natural selection. the reason for that is because if the birds that have beaks developed for eating small seeds lose all of their food, they will go hungry and eventually starve because they physically cannot eat the large seeds, therefore making the population of large beaked birds higher. also, if the trait of large beaks are dominant on the island over small beaks, then over time the large beaked birds will reproduce more and more, while the smaller beaked birds will reproduce less and less because they can't survive with the food provided. that leads to the trait of small beaks disappearing and the trait of large beaks taking over the island.