Answer:
A cheek cell
Explanation:
Human cheek cells are roughly circular or irregular in shape
The fossils that provide information on the formation of an oxygen-rich atmosphere are the stromatilites from the Precambrian era. These are layered and columnar fossils consisting mainly of cyanobacteria which were the original life form back then. These bacteria took in carbon dioxide and produced oxygen by photosynthesis as early as 2.5 billion years ago (the earth is about 4.5 billion yrs old).
Drilling with pipe and mud
The offspring inherited the dominant traits from the parent which made it automatically fully dominant. In DNA, dominant alleles mixed with recessive alleles will make 100% dominant offspring. The offspring inherited those chromosomes, which made the white trait not show up.
