The Origins Of Life & Speciation Flashcards
1
Q
Why do some species become extinct?
A
New predators New diseases New competition for food Can't survive in incorrect climate Can't find food needed
2
Q
What does extinct mean?
A
No living examples of a species is surviving
3
Q
What does the term species mean?
A
Organisms with many common factors which can breed successfully and produce fertile offspring
4
Q
How do new species arise?
A
Genetic variation & natural selection
Population isolation
Mass extinction
5
Q
What can cause environmental isolation?
A
Climate change
Land may move (continental drift)
6
Q
When is life predicted to have started?
A
3.5 billion years ago
7
Q
Why so fossils occur?
A
When a dead animal falls to the bottom of the sea/lake and is trapped in a layer of sediment
8
Q
What can disrupt the fossil record?
A
Rock cycle
