Biology, 05.05.2020 12:55 eddyreynoso5025
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: 2
Biology, 21.06.2019 21:00, diyagawande
Ausable water source is one that can be used by humans for drinking or agriculture. identify the water reservoirs as usable or unusable based on their current state. oceans rivers glaciers freshwater lakes groundwater
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Biology, 22.06.2019 01:30, ineedhelp2285
Deer cave cannot support photosynthesis is as not enough sunlight is present. in spite of this, it still has a complex food chain. what is the energy foundation of this food chain?
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The respiratory systems of birds are very efficient at providing oxygen to the blood, which is neces...
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