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Evolutionary History 3.3 (3/11) Exit Ticket

Last updated over 2 years ago

2 questions

1

Question 1

1.

What most likely explains why both the octopus and surf clam have mantles and why the mantles are different?

All species have their own specific body structures, so it is a coincidence that the octopus and surf clam each happen to have mantle structures that are different.

The octopus and surf clam are different species, so they do not share an ancestor population. These species had separate ancestor populations, and each evolved a mantle that helps it survive in its environment.

It is impossible to explain the body structures of different species. The way that structures change over time is very complex, and no one has ever observed these changes occurring.

The octopus and surf clam both inherited the mantle structure from a shared ancestor population, but this population separated into different environments. In each environment, different types of mantle evolved, which helped the populations survive.

2

Question 2

2.

How closely related do you think the octopus and surf clam are located on an evolutionary tree? Explain.
CFS:
student describes the relationship between anatomical similarities and differences in animal species
student describes the chronological difference between animal species with a common ancestor based on body structures