Transcript powerpoint

Human Origins
By: Molly McGarry
3 Hypo these of Human
Origins
 Myth~
Greek Mythology
Zeus creates humans
Myth~ Religious
Bible- Adam and Eve
Theory~ Darwin’s Theory of Evolution
All life is created from a common
ancestor.
Theory
 Theory
develops when scientific
community excepts a hypothesis as true
because there is an overwhelming
supportive evidence.
Evolution
 Evolution
can be supported by the fossil
records that include transition species
suggesting that life has changed over
time.
 The structure of human beings
Homologous and analogous
Similarities in ebryological development
and biochemical comparisons.
Fossil Evidence

Based on Fossil evidence it is suggested that
the age of the earth is 4.5 billion years old.
 Transition species link the past to the present
and show evidence that life has changed over
time from simple to more complex organisms.
 Scientist believe that Humans have evolved
from apes because we share very common
DNA structures.
Similar Embryos
 All
animals have the same early
embryonic development.
 Humans develop gills and tails just like
all other animal embryo’s
 Scientists believe that this happens
because they inherit this from distant
ancestors.
Oxygen from Bacteria
 Cyanobacteria,
which was the original
photosynthesis, produced the oxygen
that created our atmosphere.
 This made our ozone that allowed our
terrestrial life to live and prosper.
 Human respiratory systems need
oxygen to live.
Natural Selection
 Organisms
overproduce therefore there
are limited food and resources.
 By natural selection nature selects the
best traits to survive.
 These Genetic mutations account for
the changing of species over time.