8LS1 Ch6.3 Reading, Highlights & Questions - Answers

Highlights: Do you have all the highlights?

• Yes

• No

Highlights: Do you have all the highlights?

• Yes

• No

Highlights: Do you have all the highlights?

• Yes

• No

Highlights: Do you have all the highlights?

• Yes

• No

Highlights: Do you have all the highlights?

• Yes

• No

What do you think?

Statement: Living species contain no evidence that they are related to each other.

• Agree

• Disagree

What do you think?

Statement: Plants and animals share similar genes.

• Agree

• Disagree

1. How can scientists determine how closely related two species are based on their common ancestor?

• Similarities in DNA among different living species

• Fossil records found in rock layers

• Distinct species without overlapping traits

• Unique behaviors not observed in other species

2. What can studying the structural and functional similarities and differences between two different species reveal about their evolutionary relationship?

• common ancestry

• similar environmental conditions

• similarities and differences among

  structures of living species

• none of the above

3. Select the three statements that could explain how these two distantly related saber-toothed mammals developed similar blade- like canine teeth.

• Both mammals

  inherited blade-like teeth

  from the same ancestor.

• Blade-like teeth

  provided a survival

  advantage for both

  mammals.

• Both mammals

  experienced

  environmental changes to

  favor similar traits.

• Blade-like teeth

  helped each mammal

  better compete with other

  predators.

• The similarity is the

  result of interbreeding

  between Smilodon and

  Thylacosmilus.