dating fossils
comparing the fossil to its location in the rock layers
a missing link is when there is ...
discovered this in the atlantic ocean
mid-atlantic ridge
we derived this theory from whom?
alfred wegner
structures that may look the same or different, but the underlying structure is thesame
homologous structures
a fossil of which the dates are already known
index fossil
scientists rely on other ___ ___ even though that particular species doesn't represent the link
transitional fossils
continental drift
when two plates separate and magma rushing up to fill the gap: we see mountainous ridges
spread
structures look the same but the underlying structure is different
analogous structures
scientists use radioactive isotopes in the rock layers to date the rock layers
evidence of ___ ___ of transitional forms indicates that these organisms thrived and were successful as transitional forms, meaning the transition is possible
large populations
continents float on the crust
3Q's worth 100ea.
The three principals of plate tectonics
1: the continents are part of the crust
2: the crust is divided into large contiguous plates
3: these plates are in constant motion
which type of structure is indicative of common ancestry
homologous
scientists combine ___ and ___ to get the best estimate age of the fossil
relative dating and radiometric dating
OTHER: the more closely related two species are, the more similar their patterns of ___ ___ will be
embryonic development
two instances of other supporting evidence for his hypothesis
matching geographical features and fossil communities where continents line up
when two plates collide and the heavier plate goes under the lighter: we see mountains
subduction
which type of structure shows divergence and why
homologous because they're adapted for different niches
fossils show us ___ ___ over time
anatomical changes
OTHER: this compares the gene sequence of a protein: the more closely related two species are, the more similar the gene/protein will be
comparative biochemistry
He was from ___ and died in ___
Germany; Greenland
we can see changes in the ___ ___ when land masses separate or come together
fossil communities
which type of structure shows convergence and why
analogous because they're adapted for a similar niche