M1 Flashcards
This is the technique that based numeric dating. Ratios of parent and daughter isotopes can be computed
decay rate
use to find out the places of events or rocks in their chronological order or order of occurrence without knowing their actual age
relative dating
is a technique that tells the exact age of the artifact or the site using methods i.e carbon dating.
Absolute dating (other name: numeric dating)
a system that organizes the Earth’s history based on ___. It is divided into several spans of time.
geologic time scale
stratigraphy (study of Earth’s rock ayers and their ages).
There are two major eons:
Precambrian eon -4,500 m to 543 m (formation of earth from multicellular organisms)
Phanerozoic eon -till present
refers to the time when several major evolutionary occurrences take place.
Era
A period is composed of different __ enabling cross-referencing of rocks and geologic events from place to place.
subdivisions of geologic time
extinction of dinosaurs, first primates and flowering plants
diversification of dino
era: mesozoic
period:
cretaceous
jurassic
what period was the major extinction
era: paleozoic
period: permian
when did life start after meteor impacts 2.5 b years
3.8 billion years
also known as progressive evolution, a set of traits within a population consistently shifts in one direction over time, in response to various environmental pressures, genetic drift, or other factors influencing natural selection.
Directional evolution
describes a pattern of evolutionary change where organisms adapt opportunistically to exploit diverse ecological niches or resources.
involves the acquisition of diverse traits in response to changing environmental conditions.
Opportunistic evolution or divergent evolution ( adaptive opportunism
