#Question id: 9617
#XL - R Botany
The common ancestors of birds and mammals were very early (stem) reptiles, which almost certainly possessed 3-chambered hearts (2 atria, 1 ventricle). Birds and mammals, however, are alike in having 4-chambered hearts (2 atria, 2 ventricles). The 4-chambered hearts of birds and mammals are best described as
#Question id: 9618
#XL - S Microbiology
Generally, within a lineage, the largest number of shared derived characters should be found among two organisms that are members of the same
#Question id: 9618
#XL - R Botany
Generally, within a lineage, the largest number of shared derived characters should be found among two organisms that are members of the same
#Question id: 9619
#XL - S Microbiology
A common ancestor for both species C and E
could be at position number
#Question id: 9619
#XL - R Botany
A common ancestor for both species C and E
could be at position number
#Question id: 9620
#XL - R Botany
The two extant species that are most closely related to each other are