The lineage that produced chimpanzees and humans split from other primates roughly 30 million years ago Chimpanzees\' skulls have the fossils as old as 10 to 12 million years, is molars with thick enamel Trait B found in fossils as old as 55 million following features: Trait A found in postorbital wall that ventrally separates the orbit from the temporal fossa. Which of the following statements is TRUE? Trait A is more beneficial for chimpanzee survival because it is newer. Trait B is more beneficial for chimpanzee survival because it is older. Trait A is more likely to be widespread among other primate species because it is newer. Trait B is more likely to be widespread among other primate species because it is older. Your classmate shows you the two groups of lizards shown below-each made within the Evolutionary Evidence lab and asks if you can figure out how she made them. Which of the following is most likely? The lizards in Group A were independently designed, in the lizards in Group B were produced by descent with modification from a common ancestor. The lizards in Group A were produced by descent with modification from a common ancestor the lizards in Group B were independently designed. The lizards in both Group A and Group B were produced by descent with modification them common ancestor. It\'s impossible make any inferences on how these lizards were made from the information given. Each of the following graphs shows a hypothetical relationship between the predicted order of trait appearance based on trait nesting (y-axis) and the actual order of the appearance in the fossil record (x axis), for a number of traits among a group of species. Which graph would provide the best evidence that these species arose by descent with modification from a common ancestor? Solution We shall first summarize the given data - 1) Chimpanzees evolved 30 million years ago. 2) Trait A is seen in fossils as old as 10 to 12 million years old. 3) Trait B is seen in fossils as old as 55 million years old. Let us look at each option one by one- A) Trait A is more beneficial to the chimpanzees because it is newer. Although the trait is newr, there is no information in the data to support the claim that the trait is beneficial. Evolution of a new trait need not be always beneficial. Therefore, we cannot accept this statement. B) Trait B is more beneficial for chipanzee survival because it is older This statement could be true, but for the fact that it was found in fossils as old as 55 million years ago. Chimpanzees evolved 30 million years ago. It could very well be possible that the chimpanzees outgrew this trait. Hence we cannot accept this statement. C) Trait A is more likely to be widespread among the primate species because it is newer. This is an incorrect statement. Trait A evolved only 12 million years back. By this time, the lineage of chimpanzees had already separated from the earlier primate species. Therefore, the trait will not be present among oth.

1. The lineage that produced chimpanzees and humans split from other primates roughly 30
million years ago Chimpanzees' skulls have the fossils as old as 10 to 12 million years, is molars
with thick enamel Trait B found in fossils as old as 55 million following features: Trait A found
in postorbital wall that ventrally separates the orbit from the temporal fossa. Which of the
following statements is TRUE? Trait A is more beneficial for chimpanzee survival because it is
newer. Trait B is more beneficial for chimpanzee survival because it is older. Trait A is more
likely to be widespread among other primate species because it is newer. Trait B is more likely
to be widespread among other primate species because it is older. Your classmate shows you the
two groups of lizards shown below-each made within the Evolutionary Evidence lab and asks if
you can figure out how she made them. Which of the following is most likely? The lizards in
Group A were independently designed, in the lizards in Group B were produced by descent with
modification from a common ancestor. The lizards in Group A were produced by descent with
modification from a common ancestor the lizards in Group B were independently designed. The
lizards in both Group A and Group B were produced by descent with modification them common
ancestor. It's impossible make any inferences on how these lizards were made from the
information given. Each of the following graphs shows a hypothetical relationship between the
predicted order of trait appearance based on trait nesting (y-axis) and the actual order of the
appearance in the fossil record (x axis), for a number of traits among a group of species. Which
graph would provide the best evidence that these species arose by descent with modification
from a common ancestor?
Solution
We shall first summarize the given data -
1) Chimpanzees evolved 30 million years ago.
2) Trait A is seen in fossils as old as 10 to 12 million years old.
3) Trait B is seen in fossils as old as 55 million years old.
Let us look at each option one by one-
A) Trait A is more beneficial to the chimpanzees because it is newer.
Although the trait is newr, there is no information in the data to support the claim that the trait is
beneficial. Evolution of a new trait need not be always beneficial. Therefore, we cannot accept
this statement.
B) Trait B is more beneficial for chipanzee survival because it is older
This statement could be true, but for the fact that it was found in fossils as old as 55 million
years ago. Chimpanzees evolved 30 million years ago. It could very well be possible that the
chimpanzees outgrew this trait. Hence we cannot accept this statement.

2. C) Trait A is more likely to be widespread among the primate species because it is newer.
This is an incorrect statement. Trait A evolved only 12 million years back. By this time, the
lineage of chimpanzees had already separated from the earlier primate species. Therefore, the
trait will not be present among other primate species.
D) Trait B is more likely to be widespread among the primate species because it is newer.
From given information, we know the following-
Trait B evolved 55 million years back; and the lineage of chimpanzees started evolving 30
million years back.
Therefore, there is good chance that all sub lineages of chimpanzees and its related primate
species would be carrying Trait B.
Therefore, the correct option is OPTION D.