Which of the following gases was most likely present in earth's earliest atmosphere? a) nitrogen b) hydrogen c) argon d) oxygen

an organism's phenotype is the  form of a trait  that it  displays. for  flowercolor, a pea  plant  can  display  a phenotype of purple or white flowers. an organism's  genotype  is the alleles of a gene it contains. based on his data, mendel concluded that a phenotype can be  determined  by more than one  genotype.

feral cats are estimated to eat tens of millions of native animals each night in australia