7.4 How life developed

• Biologie
• biology
• Middelbare school
• vwo
• Leerjaar 3

Fossils

Today:

revision of 7.3

intro to 7.4

Learning objectives:

- what is Big Bang?

- how has Earth changed over time?

- how did life on earth changed over time? 

what is the best definition of fossil?

1. fossils are preserved remains of once living organisms.
2. fossils are petrified remains, or traces, of organisms or part of organisms from the past.
3. fossils are any preserved remains, impression, or trace of any once-living thing from a past geological age
4. fossils are the preserved remains or traces of organisms (plants, animals, etc) that lived in the distant past

How old is a fossil at least?

1. >1.000 years
2. > 10.000 years
3. > 100.000 years

What is the importance of fossils?

1. they give clues of organisms that lived long ago
2. they provide evidence about how Earth's surface has changed over time
3. they help scientists understand what past environments may have looked like.

there are two main groups of fossils:
body & trace
what is NOT a body fossil?

1. bones
2. coprolite
3. egg
4. shell

there are two main groups of fossils:
body & trace
what is NOT a trace fossil?

1. burrow
2. carbon film
3. footprint
4. track

carbon film

preserved remain

cast

mold

trace fossil

petrified fossil

what is a fossil?

1. oil formed from sea animals of long ago
2. sandstone showing ripple marks from water
3. arrowhead made thousands of years ago
4. animal tracks in rocks

characteristics of index fossils

1. Small geographical distribution, short range through time
2. Small geographical distribution, long range through time
3. Wide geographical distribution, short range through time
4. Wide geographical distribution, long range through time