7.3 Fossils

7.3 Fossils

Birds and butterflies both have wings. Are these wings homologous or analogous structures?

1. Homologous
2. Analogous

ANALOGOUS STRUCTURES

HOMOLOGOUS STRUCTURES

Homologous & analogous structures are examples of ...

1. Direct evidence
2. Indirect evidence

Fossils are examples of ...

1. Direct evidence
2. Indirect evidence

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

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.

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

carbon film

preserved remain

cast

mold

trace fossil

petrified fossil

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

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