What are proteins that are found on the surface of some red blood cells. genes
alleles
antigens
immunoglobins

I’m stuck on this question cuz i’m stupid sksksksk

Use the phylogenetic tree to the right to determine which statement below is true. organisms a and f are not related. organism e is more closely related to organism b than organism f. organisms c and d are more closely related than organisms a and b. phylogenetic trees

Which of the following is the earliest era of earth's geologic time scale? cenozoic mesozoic precambrian paleozoic