#Question id: 4957
#XL - T Zoology
How many half-lives should have elapsed if 6.25% of the parent isotope remains in a fossil at the time of analysis?
#Question id: 4958
#XL - S Microbiology
What is true of the fossil record of mammalian origins?
#Question id: 4958
#XL - T Zoology
What is true of the fossil record of mammalian origins?
#Question id: 4959
#XL - S Microbiology
If a fossil is encased in a stratum of sedimentary rock without any strata of igneous rock (e.g., lava, volcanic ash) nearby, then it should be
#Question id: 4961
#XL - S Microbiology
An early consequence of the release of oxygen gas by plant and bacterial photosynthesis was to
#Question id: 4963
#XL - S Microbiology
Which free-living cells were the earliest contributors to the formation of Earthʹs oxidizing atmosphere?