EH.Lesson 1.5

Body structures that are shared between two species are evidence that these two species​ (a)   the shared structures from a ​ (b)   ancestor population.

• inherited
• common
• different
• produced

Tags

NGSS.MS-LS4-2

Identify the descendent species.

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2

Identify the common ancestor.

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2

NGSS.MS-LS4-3

Which structures will species A most likely have?

• Nostril, back bone, tail, rear limb

• Nostril, back bone, tail, rear limb, front limb

• front limb

• there is no way to tell

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2

This fossil turtle and this living hawk both have a structure in their neck called the atlas bone. What best explains why both species have an atlas bone?

• The turtle and hawk are different species, so they must not share an ancestor population. They inherited their atlas bone structure from separate ancestor populations.

• The turtle and hawk both share the same ancestor population that had an atlas bone. They inherited this structure from the ancestor population.

• It is impossible to say. Fossils are very old; therefore, we cannot make observations of the turtle’s ancestors, and we cannot explain its body structures.

• All species have their own specific body structures, so it is a coincidence that this turtle and hawk each happen to have the atlas bone structure.

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2

This fossil pterodactyl and this living elephant both have a bone in their hip called the ilium. What best explains why both species have an ilium?

• The pterodactyl and elephant both share the same ancestor population that had an ilium bone. They inherited this structure from the ancestor population.

• All species have their own specific body structures, so it is a coincidence that the pterodactyl and elephant each happen to have the ilium bone structure.

• It is impossible to say. Fossils are very old; therefore, we cannot make observations of the pterodactyl’s ancestors, and we cannot explain its body structure.

• The pterodactyl and elephant are different species, so they must not share an ancestor population. They inherited their ilium bone structures from separate ancestor populations.

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2

Evidence: The Mystery Fossil was pregnant. If it survived, it would have had a live birth.

Why does this evidence matter?

• The mystery fossil being pregnant refutes claim 3 since crocodiles lay eggs.

• It doesn't matter.

Tags

NGSS.MS-LS1-4