Fossils Flashcards
0
Q
Fossils are found where?
A
In rocks
1
Q
Fossils are what?
A
Remains of plants and animals from many years ago
2
Q
How are fossils formed?
A
From hard parts of animals that do not decay easily
3
Q
What do we learn from fossils?
A
How different organisms have changed
4
Q
What are some reasons for extinction?
A
Changes in environment, new predators, new diseases, natural disaster.
5
Q
What is genetic variation?
A
Each population has wide range of alleles that control their characteristics
6
Q
What is natural selection?
A
Within each population , the alleles that control the characteristics that help the organism to survive
7
Q
Speciation is what?
A
The populations become so different that successful interbreeding is no longer possible
