Natural Selection Unit Test Unit 5 Lesson 12
Found on the Galapagos Islands there are several species finches, also known as Darwin's Finches. These finches share the same co-exist on the islands sharing the same habits and characteristics except for one; they all have different shaped and sized beaks. The differences in their beaks might be the most important aspect of their survival. Notice that for about ten years the populations of the two different finch species remained pretty stable largely because the two species had varied food sources. Then in 1977, there was a huge drop in finches with small beaks while there was a great increase in large-beaked birds. How can you explain this?
(1 point)
Responses
The small-beaked finches became prey for larger animals.
The small-beaked finches became prey for larger animals.
The large-beaked birds preyed on the small-beaked birds.
The large-beaked birds preyed on the small-beaked birds.
The available food changed, the small beaked birds could not readily adapt and they began to die out.
The available food changed, the small beaked birds could not readily adapt and they began to die out.
Competition for food favored the large beaks; the small beaked birds had little or nothing to eat and they died off.
Competition for food favored the large beaks; the small beaked birds had little or nothing to eat and they died off.
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Competition for food favored the large beaks; the small beaked birds had little or nothing to eat and they died off.
Use the table to answer the question.
Brain Size (g) Body Size (kg)
M=
Badger 53 6
Caribou 288 110
Dog 70.2 8.5
Hedgehog 3.5 0.93
Spider Monkey 114 9.1
Using the matrix, what is the value of M3,1 ?
(1 point)
Responses
6
6
53
53
8.5
8.5
70.2
The value of M3,1 is 53.
Penguins have evolved from birds that used to fly. At some stage, the penguin ancestors became increasingly adept at swimming and lost the ability to fly. In the trade-off, their short, powerful wings make excellent flippers for "flying" underwater, being less fragile and creating less drag than the long wings of many other seabirds. Another advantage of giving up flight is that they can put on weight. The ability to store food reserves as fat is an advantage for birds that have to travel far to obtain food, and larger penguins can dive deeper and for longer.
Consider each of the conclusions listed. Sort each conclusion according to whether it is supported by the data.