Slide 17

Question 1

In which scenario does range expansion re-develop sympatry relevant

Answer 1

Peripatric and parapatric speciation

Question 2

Secondary contact for allopatric speciation

Answer 2

Geographical barrier removed

Question 3

4 consequences to secondary contact

Answer 3

Fusion
Reinforcement
Stable hybrid zones
Speciation

Question 4

Name the three main eras in order

Answer 4

Paleozoic -> Mesozoic -> Cenzoic

Question 5

What is meant by the habitable zone?

Answer 5

Earth is not too cold and not too hot

Question 6

2 evidence for RNA rather than DNA to be in the first life form

Answer 6

1. RNA can self-replicate
2. RNA catalyzes biochemical reactions

Question 7

Why do scientists believe first cyanobacteria was anaerobic

Answer 7

Little evidence of oxygen in early earth

Question 8

Cyanobacteria are known as stromatolites. When are they dated back to?

Answer 8

3.5 bya

Question 9

2 facts about cyanobacteria

Answer 9

• developed photosynthesis
• led to increase in oxygen in the atmosphere

Question 10

Phylum of jellyfish, sea pen, and coral

Answer 10

Cnidaria

Question 11

Phylum of comb jellies

Answer 11

Ctenophora

Question 12

When did cambrian explosion occur

Answer 12

520-540 mya

Question 13

What era started after cambrian explosion?

Answer 13

Paleozoic era

Question 14

3 characteristics on how cambrian animals differed in morphology compared to precambrian animals

Answer 14

Cambrian:
- larger
- elaborate mouthparts
- bilateral symmetry

Question 15

What caused the cambrian explosion

Answer 15

Oxygen

Question 16

In which period and era did colonization of land by animals and plants happened

Answer 16

Devonian period, paleozoic era

Question 17

Thee major types of plants

Answer 17

Non-vascular plants, seedless vascular plants, seed plants

Question 18

List 5 major extinctions (in order)

Answer 18

End cretaceous
Late triassic
End permean
Late devonian
End ordovician