Question :
11.Absolute dating uses ______ to estimate how old a fossil : 1775165
11.Absolute dating uses ______ to estimate how old a fossil is.
A.Depth within rock layers
B.Radioactive isotopes
C.A molecular clock
D.Structural features
E.Embryonic structures
12.If an isotope's half-life is 100 years:
A.That isotope will no longer exist in 50 years
B.That isotope will no longer exist in 200 years
C.In 50 years only half of the atoms in a sample of that isotope will remain
D.In 100 years only half of the atoms in a sample of that isotope will remain
E.In 200 years only half of the atoms in a sample of that isotope will remain
13.Carbon-14 is useful in determining the age of a fossil up to about:
A.40,000 years ago
B.10,000 years ago
C.20,000 years ago
D.50,000 years ago
E.100,000 years ago
14.Potassiam-40 is useful in determining the age of a fossil:
A.In samples less than 25,000 years of age
B.In samples less than 50,000 years of age
C.In samples 300,000 years of age and older
D.In samples aged between 50,000 and 100,000 years of age
E.In samples aged between 100,000 years and 250,000 years
15.Earth once consisted of a single large landmass and one ocean. The landmass is named:
A.Panthalassa
B.Pangaea
C.Laurasia
D.Gondwana
E.Ultima Continenta
16.Earth once consisted of a single large landmass and one ocean. The ocean is named:
A.Pangaea
B.Laurasia
C.Gondwana
D.Oceana
E.Panthalassa
17.If similarities between two structures in different organisms reflect common ancestry, these structures are:
A.Vestigial
B.Analogous
C.Homologous
D.Homeotic
E.Heterologous
18.If similarities between two structures in different organisms reflect independent evolution, these structures are:
A.Analogous
B.Vestigial
C.Homologous
D.Homeotic
E.Heterologous
19.If a structure has no apparent function in one species, yet is homologous to a functional organ in another species, this structure is termed:
A.Analogous
B.Homologous
C.Homeotic
D.Vestigial
E.Heterologous
20.A gene that, when mutated leads to organisms with structures in abnormal places, is termed:
A.Parsimonious
B.Homeotic
C.Homologous
D.Vestigial
E.Dominant
