Mammals and birds have four-chambered hearts and fully divided pulmonary and systemic circulations. the circulatory systems of reptiles and amphibians are sometimes presented as “inferior” because pulmonary and systemic circulations are not completely separate. what might be an advantage to incompletely separated circuits in these organisms?

Wich level of organization includes all the other levels or organizations

In the desert, saguaro cacti, owls, horned lizards, and fire ants all share the same space. which of the following can be considered a population? question 9 options: all plants in the same area all cacti in the same area all species in the same area the lizards and the ants

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population.b) the separated population is small, and genetic drift occurs.c) the isolated population is exposed to different selection pressures than the ancestral population.d) different mutations begin to distinguish the gene pools of the separated populations.e) gene flow between the two populations is extensive.