Descent with Modification Video Lessons

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Problem: The Canary Islands are seven islands just west of the African continent. The islands gradually became colonized with life: plants, lizards, birds, etc) Three different species of lizards found on the islands are similar to one species found on the African continent (Thorpe & Brown, 1989). Because of this, scientists assume that lizards traveled from Africa to the Canary Islands by floating on tree trunks washed out to sea. Lizards eat a variety of insects and plants. Which statement describes the availability of food for lizards on the Canary Islands?a. Finding food is not a problem since food is always in abundant supply.b. Since lizards can eat a variety of foods, there is likely to be enough food for all of the lizards at all times.c. Lizards can get by on very little food, so the food supply does not matter.d. It is likely that sometimes there is enough food, but at other times there is not enough food for all of the lizards.

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The Canary Islands are seven islands just west of the African continent. The islands gradually became colonized with life: plants, lizards, birds, etc) Three different species of lizards found on the islands are similar to one species found on the African continent (Thorpe & Brown, 1989). Because of this, scientists assume that lizards traveled from Africa to the Canary Islands by floating on tree trunks washed out to sea. 

Lizards eat a variety of insects and plants. Which statement describes the availability of food for lizards on the Canary Islands?

a. Finding food is not a problem since food is always in abundant supply.

b. Since lizards can eat a variety of foods, there is likely to be enough food for all of the lizards at all times.

c. Lizards can get by on very little food, so the food supply does not matter.

d. It is likely that sometimes there is enough food, but at other times there is not enough food for all of the lizards.

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Our tutors rated the difficulty ofThe Canary Islands are seven islands just west of the Africa...as medium difficulty.

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Based on our data, we think this problem is relevant for Professor Farrell's class at HARVARD.