Question | Answer |
Name the 4 eras from the youngest to the latest | cenozoic, mesozoic, paleozoic, precambrian |
What periods are in the 1st era? (2) | Quaternary & Tertiary |
What periods are in the 2nd era? (3) | Cretaceous, jurassic, triassic |
What periods are in the 3rd era? (3) | 1st, 2nd, Cambrian |
Towards the end of this era, creatures w/ more than 1 cell evolved, including jellyfish and _______. | Precambrian,sponges |
What 3 types of worms were formed int the Precambrian era? | segmented worms, flat worms, roundworms |
2.5 billion-542 million yrs. ago | precambrian |
prokaryotes | single cell organism w/ nucleus-precambrian |
eukaryotes | single cell organism w/ no nucleus-precambrian |
542-488 million yrs. ago | cambrian |
488-359 million yrs. ago | 2nd |
359-248 million yrs. ago | 1st |
144-165 million yrs. ago | cretaceous |
213-144 million yrs. ago | jurassic |
248-213 million yrs. ago | triassic |
65-1.8 million years ago | tertiary |
1.8 million-___ | quaternary |
mammals begin to evolve and take over | tertiary |
when dinosaurs begin to dominate the earth | triassic |
the high point if the dinosaurs, first birds, flowering plants, mammals | jurassic |
flowering plants dominate, flying insects develop dinosaurs become extinct | cretaceous |
1st reptiles and seed plants and cone bearing trees | 1st |
first land plants, jaw fish, amphibians, alge is dominant, mushrooms & fungi | 2nd |
simple inverderbraes, arthropods | cambrian |
Darwin spent __ years reaserching findings from the HMS Beagle trip | 20 |
Darwin focused on: (2) | Finches, tortises |
After coming home, Darwin started to investigate: (2) | breeds of dogs, varieties of flowers |
4 factors that govern natural selection | 1)organisms produce more offspring than can survive: 2)variations are found among individual species: 3) some of the variations enable members of a population to survive and reproduce better than others: 4) over time, more of the individuals with the help |