Give two similarities between each of the skulls that might lead to the conclusion that these are all related species.

What is the biggest change in skull anatomy that occurred from the dawn horse to the modern day horse?

What is the biggest change in leg anatomy that occurred from the dawn horse to the modern day horse?

Organisms that are closely related may also have physical similarities before they are even born. Take a look at the six different embryos below. Hypothesize which embryos is the Human, Chicken, Rabbit, Tortoise, Salamander, and Fish

These are older, more developed embryos from the same organisms. Does this change your Hypothesis? If so, write your changes below.

These are embryos at their most advanced stage, shortly before birth. Make your last hypothesis for each embryo. It should be easier to tell which embryo is going to develop into which animal.

Structures with the same parts have different functions; suggests that organisms share a common ancestry

• vestigial structures
• homologous structures
• adaptive radiation
• fossil

Tags

NGSS.MS-LS4-2

What is this an example of?

• Homologous structure

• Analogous structure

• Vestigial organs

• Functional adaption

Tags

NGSS.MS-LS4-2

Which of the following is an example of a vestigial structure?

• the wings of a red-tailed hawk
• the hind limbs of a house cat
• the fins of sharks
• the tailbone of a human

Tags

NGSS.MS-LS4-2

What conclusions can be made based on this table shown?

• the American black bear and the giant panda are most closely related

• the giant panda and the red panda are most closely related

• the red panda and the racoon are the most closely related

• the giant panda and the racoon are most closely related

Tags

NGSS.HS-LS3-1

NGSS.HS-LS4-1