Fossil Types
When an organism leaves behind evidence of what it did, like dig a burrow, walk around, make a nest, that evidence would be called a ___________ fossil.
Trace
Uranium-238 has a half live of 4.5 billion years. If a 200g sample of Uranium decays for about 2 billion years, how many grams might be left? (I'll take all reasonable estimates)
less than 200g, more than 100g
Mary was born before Charles, Charles was born before Billie. This sentences puts the births into ______________ order, or uses ___________ dating (need both blanks)
chronological, relative
What provides the clearest evidence that living things have changed over time?
the fossil record/fossils
When the fossil is a hole or depression, leaving a space where the organism was, it is called a ____________ fossil.
Carbon-14 decays into Nitrogen-14 with a half life of 5,700 years. If an organism died about 15,000 years ago, what would be a good estimate for what percent of the original Carbon-14 would be left?
A person who goes out to find fossils or studies ones that have been found is called a ______________.
Paleontologist
If a shark tooth fossil is found in the desert, what does that tell you?
The area used to be underwater.
When the organism itself is petrified and minerals fill in the mold leaving a 3-D fossil of the organism, it is called a _________ fossil.
Cast
What part of a half live (decimal or percent, USE A LABEL) has gone by if a sample of Carbon-14 has been decaying for 400 years? (Carbon-14 has a half life of 5,700 years)
400 years = H x 5,700
H = 0.07 or 7%
To determine the relative age of rocks or fossils, one must understand the _______ ____ _____________.
Law of Superposition
What is more likely to form a fossil, a jellyfish or a turtle? Why?
turtle, hard parts fossilize easier
If the actual and original tissues of the organism is encapsulated and preserved, it is called an _____________ fossil.
Inclusion
How many half lives would have gone by if there is the same amount of daughter isotope as there is parent isotope?
There are over 350,000 different species of beetles. Beetles are therefore a very ___________ type of animal. (Use a vocab word)
Diverse/diversity
What trait, unique to hominids (human-like species), was Lucy famous for?
walking upright/bipedalism
If a detective pours concrete into footprints left at the scene and then pulls up the dried concrete to see the design of the shoe, he is making a ___________. (a type of fossil shares this name)
Cast
How many half lives would have gone by if there is 3 times as much daughter isotope as there is parent isotope?
2 half lives
One atoms has 1 protons and zero neutrons, giving it a mass of 1. Another atoms has 1 proton and two neutrons. What word could describe the relationship between these two atoms?
isotopes
What process is the opposite of extinction?
Speciation