Answers: 2
Biology, 21.06.2019 18:30
The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.
Answers: 2
Biology, 22.06.2019 14:30
Even though the ostrich is a flightless bird, ostriches still possess wings that stretch approximately two meters across when fully extended. scientists speculate that when dinosaurs became extinct, some of the birds that lived during that time became land dwellers since they were able to consume the food that the dinosaurs once ate. over time, these species grew larger and heavier. eventually, the ostrich species became too big to fly. the wings found on ostriches are known as a. analogous structures. b. homologous structures. c. vestigial structures. d. symmetrical structures.
Answers: 2
Which animals are vertebrates? check all that apply. jellyfish lizards horses grasshoppers birds...
Mathematics, 24.02.2021 18:50
Mathematics, 24.02.2021 18:50
Mathematics, 24.02.2021 18:50
Mathematics, 24.02.2021 18:50
Mathematics, 24.02.2021 18:50
Mathematics, 24.02.2021 18:50
Mathematics, 24.02.2021 18:50
Mathematics, 24.02.2021 18:50