Natural Selection
An advantageous trait that becomes more common in a population is also known as a(n) ____________.
Adaptation
Evolution is best described as:
The gradual change and development of species over time, arising from a common ancestor.
What are the two things that the geologic time scale are based on?
Rock layers and fossil
What is relative age?
Relative age determines the "relative" order of past events.
Type of natural selection where certain traits evolve because they help attract a mate, even if they don't directly contribute to survival.
Sexual Selection
During the Industrial Revolution, dark ash in the air caused tree lichen that was normally white to darken. What advantageous trait helped moths camouflage themselves in this environment during this time?
Dark Wings
How many major extinctions has Earth suffered?
5 major
What is an index fossils? Give me two of the four characteristics.
Special fossils that are wide spread, recognizable, short life-span, abundant. Tool to determine the age of rocks.
What is the process where organisms better adapted to their environment tend to survive and produce more offspring.
Natural Selection
When creatures have similar traits, this is a clue that they are _________.
Related
What is a fossil?
A fossil is a preserved remains or trace of an organisms
What type of rock are fossils found? igneous or sedimentary
Sedimentary rock
Most mountain hares have white fur because they rely on snow for protection in winter. Only a few hares have dark fur. Due to global warming, there has been a decrease in snowfall, and only rarely is there any snow on the ground. How do you think this might affect the population of mountain hares?
There will be more hares with dark fur because they will be less visible in their snow-free environment and will pass on their genes for dark fur to their offspring.
What are the three evidence of evolution?
Embryos
Fossils
Skeletal Structures
What were the first animals on Earth?
Jellyfish, sponges, bacteria
What is Absolute Age?
Uses the decay of radioactive elements to find the absolute age of a rock or fossil.
How do Darwin's Finches show natural selection.
Beak size reflect what the birds eat
Different behaviors
Where they live on the island
What is convergent evolution? Ex is the birds and bats
When unrelated species develop similar traits because they live in similar environments or face similar challenges.
Where was the oldest rock found and how old is that rock?
4.4 m.y. rock found in Australia
Find the age of the rock...there is 25% of uranium-235 remaining. Uranium's half-life is 704 million years.
100--50--25
1408 million years