Biology, 04.05.2020 22:35 valeriegarcia12
The respiratory systems of birds are very efficient at providing oxygen to the blood, which is necessary for birds to expend the energy necessary to fly. What feature of the bird respiratory system makes it more efficient than the respiratory systems of other animals?
A. a one-way air flow through the lungs and airways
B. a two-way air flow through the lungs and airways
C. bubble-like alveoli for gas exchange in the lungs
D. many tracheal tubes that connect the lungs to the skin
Answers: 1
Biology, 21.06.2019 17:50
Aeukaryotic cell must be from a plant if the cell a) a nucleus b) a nuclear envelope c) cytoplasm d) a cell wall
Answers: 1
Biology, 22.06.2019 08:00
Immature bone cells, or osteoblasts, manufacture a protein called osteoid as well as several hormones. because of this, we would expect osteoblasts to contain numerous a) nuclei. b) ribosomes. c) lysosomes. d) golgi bodies.
Answers: 1
The respiratory systems of birds are very efficient at providing oxygen to the blood, which is neces...
Mathematics, 10.03.2021 22:40
Mathematics, 10.03.2021 22:40
Mathematics, 10.03.2021 22:40
Mathematics, 10.03.2021 22:40
Mathematics, 10.03.2021 22:40
Chemistry, 10.03.2021 22:40
Social Studies, 10.03.2021 22:40
History, 10.03.2021 22:40
Mathematics, 10.03.2021 22:40
Computers and Technology, 10.03.2021 22:40
Arts, 10.03.2021 22:40