Biology Chapter 29 Evolution !

Question 1

Where are most fossils found

Answer 1

sedimentary rocks

Question 2

Process of formation of fossils

Answer 2

1. dies -> covered by sediments -> soft part decomposed -> hard parts left behind
2. new sediments over older ones, compress them into layers of sedimentary rocks. Minerals in water deposit in the skeleton and turn it into fossil
3. Earth movement raises sedimentary rocks above water. Further earth movement and weathering exposes the fossils

Question 3

Do lower fossils have a higher or lower relative age

Answer 3

lower

Question 4

Do upper fossils have a higher or lower relative age

Answer 4

Lower

Question 5

Similarities of modern species and ancient species

Answer 5

existing life forms arose from pre-existing life forms

Question 6

Differences between modern species and ancient species

Answer 6

organisms changed over time to adapt to changing

Question 7

What are some reasons for missing links of fossil records

Answer 7

1. inability to form fossils
2. inability to find complete fossil record

Question 8

Why are some organisms unable to form fossils

Answer 8

1. not all organisms can be fossilized
2. remains of organisms eaten / decomposed
3. conditions in which organisms die not suitable for fossil formation

Question 9

Why is it impossible to find complete fossil records

Answer 9

1. located in inaccessible areas
2. most fossils are only body parts, not whole organisms
3. chance of discovering fossils are low

Question 10

Two ways to find evolution

Answer 10

1. similarities in anatomical structure
2. similarities in biomolecules

Question 11

Basics of similarities in anatomical structure

Answer 11

Homologous structure evolved from common ancestor

Question 12

Basics for similarities in biomolecules

Answer 12

More similarities in their base sequence of DNA have closer phylogenetic relationship