#Question id: 2679
#SCPH05 I Biotechnology
When the same region, or locus, of a chromosome has two (or more) slightly different DNA sequences in different chromosomes or individuals of the same species, these are described as
#Question id: 5530
#SCPH01 Biochemistry
The cavity inside the blastula is called the
#Question id: 19143
#SCPH01 Biochemistry
#Question id: 5545
#SCPH01 Biochemistry
The placenta functions as a(n):
#Question id: 8294
#SCPH05 I Biotechnology
The common ancestors of birds and mammals were very early (stem) reptiles, which almost certainly possessed three-chambered hearts (two atria, one ventricle). Birds and mammals, however, are alike in having four-chambered hearts (two atria, two ventricles). The fourchambered hearts of birds and mammals are best described as ________.