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Biology chapter 18
Terms in this set (18)
The principle of common ancestry states that all life on Earth can be traced back to a single ancestor
the last universal common ancestor (LUCA).
The hypothesis by Oparin/Haldane independently suggested organic molecules could be formed in the presence of outside energy sources using atmospheric gases.
Is sometimes called the "primordial soup" hypothesis.
the iron-sulfur world hypothesis
is the remains or traces of past life, usually preserved in sedimentary rock.
is the study of fossils and the history of life, ancient climates, and environments.
has been going on since the Earth was formed; it is an accumulation of particles that vary in size (sediment)
geologists discovered that strata of the same age contain the same fossils,
, a recognizable layer in a stratigraphic sequence.
fossils can be used for the——— dating of strata.
Absolute dating relies on_________...______, to determine the actual age of fossils.
radioactive dating, or radiometric techniques
which divides the history of the Earth into eras, and then periods and epochs.
Boulders called___________ from this early time resemble living stromatolites with cyanobacteria on the outer surface.
O2 forms ozone or O3 in the upper atmosphere, contributing to the _______________and blocking ultraviolet radiation from reaching the Earth's surface; this allowed organisms to live on land.
states that a nucleated cell engulfed prokaryotes, which then became organelles.
The endosymbiotic theory
is the total disappearance of a species or higher taxonomic group.
is the disappearance of large numbers of species or higher groups in a short geological time, just a few million years.
was confirmed in the 1960s; the continents moved with respect to one another.
. is the study of the behavior of the Earth's crust in terms of moving plates that are formed at ocean ridges and destroyed at subduction zones.
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