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Organisms that possess homologous structures probably
complex structures often evolve step-by-step.
3
nucleotides
Seaweeds were too soft to fossilize well.
a sequence of bases that determine the traits of an organism.
evolved from the same ancestor.
are found in the deepest strata.
the order of bases (As, Ts, Cs and Gs) in the molecule.
The oldest fossils usually
complex structures often evolve step-by-step.
3
nucleotides
Seaweeds were too soft to fossilize well.
a sequence of bases that determine the traits of an organism.
evolved from the same ancestor.
are found in the deepest strata.
the order of bases (As, Ts, Cs and Gs) in the molecule.
We know a lot about fossil crabs, snails and corals, but not much about ancient seaweeds. Why do you suppose this is the case?
complex structures often evolve step-by-step.
3
nucleotides
Seaweeds were too soft to fossilize well.
a sequence of bases that determine the traits of an organism.
evolved from the same ancestor.
are found in the deepest strata.
the order of bases (As, Ts, Cs and Gs) in the molecule.
The information carried by a DNA molecule is in
complex structures often evolve step-by-step.
3
nucleotides
Seaweeds were too soft to fossilize well.
a sequence of bases that determine the traits of an organism.
evolved from the same ancestor.
are found in the deepest strata.
the order of bases (As, Ts, Cs and Gs) in the molecule.
The fossil record of horses reveal that
complex structures often evolve step-by-step.
3
nucleotides
Seaweeds were too soft to fossilize well.
a sequence of bases that determine the traits of an organism.
evolved from the same ancestor.
are found in the deepest strata.
the order of bases (As, Ts, Cs and Gs) in the molecule.
Biologists group living things into how many domains?
complex structures often evolve step-by-step.
3
nucleotides
Seaweeds were too soft to fossilize well.
a sequence of bases that determine the traits of an organism.
evolved from the same ancestor.
are found in the deepest strata.
the order of bases (As, Ts, Cs and Gs) in the molecule.
A gene is
complex structures often evolve step-by-step.
3
nucleotides
Seaweeds were too soft to fossilize well.
a sequence of bases that determine the traits of an organism.
evolved from the same ancestor.
are found in the deepest strata.
the order of bases (As, Ts, Cs and Gs) in the molecule.
A DNA molecule is a polymer made of subunits (monomers) called
complex structures often evolve step-by-step.
3
nucleotides
Seaweeds were too soft to fossilize well.
a sequence of bases that determine the traits of an organism.
evolved from the same ancestor.
are found in the deepest strata.
the order of bases (As, Ts, Cs and Gs) in the molecule.
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