Descent with Modification Video Lessons

Concept

# 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 &amp; 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.

###### Problem Details

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.

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Descent with Modification concept. You can view video lessons to learn Descent with Modification. Or if you need more Descent with Modification practice, you can also practice Descent with Modification practice problems.

What is the difficulty of this problem?

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

How long does this problem take to solve?

Our expert Biology tutor, Kaitlyn took 5 minutes and 22 seconds to solve this problem. You can follow their steps in the video explanation above.

What professor is this problem relevant for?

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