LS 4.2

This bandicoot, this sea lion, and this zebra have similarities and differences in their body structures. What does the information about these structures tell you about the ancestors of these species?

• None share an ancestor population because different species cannot share an ancestor population. It is a coincidence that these species have some of the same body structures.

• Sea lions and zebras share the same ancestor population, but they must not share an ancestor with bandicoots because sea lions and zebras do not have a pouch for their babies.

• All three species share an ancestor population, but sea lions and zebras share a more recent ancestor population. This is why neither shares the pouch structure for their babies.

Tags

NGSS.MS-LS4-2

This living jumping spider and this fossil eurypterid both have body structures called chelicerae. Chelicerae are a body structure used for eating. What best explains why both species have chelicerae?

• They inherited chelicerae from separate ancestor populations.

• The jumping spider and eurypterid both share the same ancestor population that had chelicerae. They inherited this structure from the ancestor population.

• It is a coincidence that this jumping spider and eurypterid each happen to have a chelicerae structure.

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2

This octopus and this surf clam both have a body structure called a mantle, which covers their soft bodies. However, the mantle is shaped differently in the two species. The octopus’s mantle has muscles that help the octopus swim. The surf clam’s mantle helps the clam build its shell. What most likely explains why both the octopus and surf clam have mantles and why the mantles are different?

• It is a coincidence that the octopus and surf clam each happen to have mantle structures that are different.

• 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.

• It is a coincidence that the octopus and surf clam each happen to have mantle structures that are different.

Tags

NGSS.MS-LS4-2

What does the diagram show?

• All three species share a common ancestor, but the bold jumping spider and common octopus are more closely related to each other than they are to the Bombay locust.

• All three species share a common ancestor and are equally related to one another.

• All three species share a common ancestor, but the bold jumping spider and Bombay locust are more closely related to each other than they are to the common octopus.

Tags

NGSS.MS-LS4-2

This tortoise and this moray eel both have jaws that help them grab food. However, they have different structures in their jaws for eating. The tortoise has a bony beak that helps it bite plants. The moray eel has sharp teeth that help it eat fish. What most likely explains why both have jaws and why the jaws are different?

• It is a coincidence that this tortoise and moray eel each happen to have jaws that are different.

• Tortoises and moray eels are different species, so they do not share an ancestor population. These species had separate ancestor populations, and each evolved jaws that help it survive in its environment.

• Tortoises and moray eels both inherited jaws from a shared ancestor population, but this population separated into different environments. In each environment, different types of jaws evolved that help the populations survive.

Tags

NGSS.MS-LS4-2

NGSS.MS-LS4-4

This locust, this jumping spider, and this Roman snail have similarities and differences in their body structures. What does the information about these structures tell you about the ancestors of these species?

• None share an ancestor population because different species cannot share an ancestor population. It is a coincidence that these species have some of the same body structures.

• All three species share an ancestor population, but locusts and jumping spiders share a more recent ancestor population. This is why they share the exoskeleton structure.

• Locusts and jumping spiders share an ancestor population, but they must not share an ancestor with Roman snails because Roman snails have a shell.

Tags

NGSS.MS-LS4-2

Refer to the evolutionary tree below. What term should replace the question mark?

• Descendent Species

• Common Ancestor Population

• Organism

Tags

NGSS.MS-LS4-2

This living manta ray and this fossil shark both have a skeleton made of cartilage (which is softer than bone). What best explains why both species have a skeleton like this?

• It is a coincidence that the manta ray and shark each happen to have a cartilage skeleton structure.

• They inherited cartilage skeletons from separate ancestor populations.

• The manta ray and shark both share the same ancestor population that had a cartilage skeleton. They inherited this structure from the ancestor population.

Tags

NGSS.MS-LS4-2

This living sea star and fossil sea urchin both have body structures that are formed along five lines. What best explains why both species have this five-lined body structure?

• The sea star and sea urchin both share the same ancestor population that had a five-lined body structure. They inherited this structure from the ancestor population.

• It is a coincidence that this sea star and sea urchin each have this specific type of five-lined body structure.

• They must have inherited this five-lined body structure from separate ancestor populations.

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2

The body structures for a population of green herons (a species of bird that lives near water) were stable for a long time. Then, their body structures changed to make the green herons taller. Why did this happen?

• Their environment must have changed.

• It is impossible to say without more information.

• The green heron population wanted to be taller.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-4

NGSS.MS-LS4-4