Read the following statements. Then, answer the question below.
Human embryos have structures called notochords. The notochord develops into part of the backbone as the embryo grows.
Lamprey embryos also have notochords. In lampreys, notochords are found in adults, too.
Sea stars do not have notochords at any stage of development.
Based on this information, which evolutionary tree correctly shows the relationship between humans, lampreys, and sea stars?
Choose 1 answer:
Choose 1 answer:
(Choice A) A diagonal line starts at the bottom of a diagram and travels up and to the right. It is labeled lamprey at the top. Two diagonal lines branch off of this main line and travel up and to the left until they reach the same level as the top of the main line. The shorter of these lines branches off near the top and is labeled sea star. A slightly longer line branches off near the bottom and is labeled human.
A
A diagonal line starts at the bottom of a diagram and travels up and to the right. It is labeled lamprey at the top. Two diagonal lines branch off of this main line and travel up and to the left until they reach the same level as the top of the main line. The shorter of these lines branches off near the top and is labeled sea star. A slightly longer line branches off near the bottom and is labeled human.
(Choice B) A diagonal line starts at the bottom of a diagram and travels up and to the right. It is labeled human at the top. Two diagonal lines branch off of this main line and travel up and to the left until they reach the same level as the top of the main line. The shorter of these lines branches off near the top and is labeled lamprey. A slightly longer line branches off near the bottom and is labeled sea star.
B
A diagonal line starts at the bottom of a diagram and travels up and to the right. It is labeled human at the top. Two diagonal lines branch off of this main line and travel up and to the left until they reach the same level as the top of the main line. The shorter of these lines branches off near the top and is labeled lamprey. A slightly longer line branches off near the bottom and is labeled sea star.
(Choice C) A diagonal line starts at the bottom of a diagram and travels up and to the right. It is labeled sea star at the top. Two diagonal lines branch off of this main line and travel up and to the left until they reach the same level as the top of the main line. The shorter of these lines branches off near the top and is labeled human. A slightly longer line branches off near the bottom and is labeled lamprey.
C
A diagonal line starts at the bottom of a diagram and travels up and to the right. It is labeled sea star at the top. Two diagonal lines branch off of this main line and travel up and to the left until they reach the same level as the top of the main line. The shorter of these lines branches off near the top and is labeled human. A slightly longer line branches off near the bottom and is labeled lamprey.
B
A diagonal line starting at the bottom and traveling up to the right with human at the top, branching off to lamprey near the top, and sea star branching off near the bottom accurately reflects the evolutionary relationship between humans, lampreys, and sea stars based on the presence or absence of notochords.