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Scientists can use relative dating, absolute dating, or a combination of the two techniques to determine the age of a fossil. The best answer from the following could be determined using both methods:
A.the difference in age between two fossils
B.which of two fossils is the older
C.a narrow age range for a fossil
D.the exact age of a fossil
What is which of the two fossils is the older?
Imprints of the shells of ocean clams are often found in the rocks of the Appalachian Mountains. This is what these imprint fossils MOST likely indicate.
What is the mountains were once under the ocean?
This is the older between an intrusion and the rock layers it cuts across.
What are the layers it cuts across?
This characteristic BEST helps scientists classify organisms.
What is structure?
The adaptation that is LEAST important for human survival:
A.having thumbs B.eye color
C.walking upright D.developing language
What is eye color?
You are given a diagram that represents a classification of living organisms beginning with archaea, bacteria, & eukarya. This would be the best title for the diagram.
What are domains?
There was a fossil found in a rock layer above a fossil in another rock layer. This is the relative age of the fossil found above the other one.
What is younger than the one below it?
This era is known as the “Age of Mammals.”
What is the cenozoic era?
This was the first person to base a system of classification on organisms having similar structures.
Who was Linnaeus?
Organisms can be separated by their MOST basic characteristics into the broadest groups known as these.
What are domains?
According to the fossil record, the first horses were smaller than modern species. Horses have gradually changed over time in response to this.
What is changing environment?
A paleontologist found a fossil of an organism that looks like modern-day ferns. This would most likely assist the paleontologist in proving that the two organisms are related.
What is comparing the structures of the fossil to that of modern-day ferns?
This is another name for natural selection.
What is survival of the fittest?
This best explains why the finches in the Galapagos Islands evolved with differently shaped beaks.
What is they adapted to eating different types of food?
This is how organisms classified as Eukarya are different from organisms classified as Archaea and Bacteria.
What is they have membrane-bound nuclei?
A new predator has just moved into an area with a population of rabbits. The rabbits with longer back legs have an advantage because they can run faster. This is an example of adaptation in the future because of this situation.
What is future generations of rabbits will have longer legs?
This is the most accurate method used in determining the age of a fossil.
What is radioactive dating?
The half-life of a radioactive element, such as carbon-14, is the time it takes for half of the atoms of the element to decay. This is how many half-life periods have passed if a fossil contains 1/32 of the original amount of carbon-14.
What are 5 half-lives?
This describes an inherited trait that gives an organism a survival advantage in its particular environment.
What is an adaptation?
Organisms that live in extremely hot or acidic environments belong to this domain.
What is archaea?
This type of ancient ocean organisms could most likely be studied today using fossils and this is where you might find them.
What are animals with hard body parts and in the deep ocean?
Charles Darwin made famous observations of finches on islands in the Pacific Ocean. The birds were believed to have come all from one population, but when separated on the islands with differing habitats, the birds changed. The beaks of the birds on islands with lots of seeds were different from the beaks of the birds on islands with lots of insects. This is how their beaks came to match the food in their environments so well.
What is the birds with the “right” beaks for the food supply had more young?
The half-life of carbon-14 is 5700 years. Measurements of a fossilized skull indicate that it has a carbon-14/carbon-12 ratio that is equal to about 1/8 that of the skulls of present-day animals. This is approximately how old the skull is.
What is 17,100 years old?
Scientists have found traces of organic compounds on some meteorites. This finding would support this hypothesis about the origin of macromolecules on Earth.
What is organic molecules arrived on Earth with space debris?
Organisms can reproduce with spores in this domain.
What is Eukarya?