unit 1
what is a fossil record?
a collection of fossils that are placed in chronological order
what is a primitive trait?
a primitive trait is a characteristic that was present in a common ancestor
what is mass extinction
a mass extinction is the extinction of a large number of species in a relatively short period of time
if the fossil of a shape that was earlier than the triangle was discovered, what would it look like
the shape would most likely have two sides
what is behavioral adaptation
a behavioral adaptation is a behavior or activity performed by an organism that increase its fitness
what traits are selected by natural selection
it selects traits that provides the organism with the best chance of surviving
what is a derived trait?
a derived trait is a characteristic that was not present in a common ancestor
how can a mutation be beneficial to an organism?
a mutation can be beneficial if it increases the fitness of the individual
what is a mutation
a mutation is a change in the DNA of an organism
what is a symbiotic relationship?
a symbolic relationship is a relationship between different organism that live in an economy or ecosystem
can an organism have any adaptation that they want
no, an organism cannot have any adaptation that they want
how does artificial selection work?
humans select the trait in an organism that are the most useful for humans and they breed it with another organism until they have the desirable trait
how can a mutation change an organism's trait?
proteins that are built off of DNA can become nonfunctional if the protein that used to function does not after the mutation the organism's trait will change
why would a fossil found down in the earth be older than a fossil higher up?
sedimentary rock generally forms in layers within the earths system are called strata
what are physical relationships
a physical relationship is a modification that is made to an organism's physical structure these type of adaptations increase an organism fitness