Badbpyz7987
16.07.2019 •
Biology
Young tadpoles breath like fish. what structure enables them to breathe underwater a. tracheae b. skin c. alveoli d. gills
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Ответ:
The correct answer is Gills
I took the test, this was the correct answer.
Ответ:
The circulatory system has evolved over time from simple diffusion through cells, in the early evolution of animals, to a complex network of blood vessels that reach all parts of the human body. Made of specialized and unique cardiac muscle, it pumps blood throughout the body and to the heart itself.
Claps shut at birth. Evolutionary changes in the vertebrate heart are tied to change from single to double-circuit heart, with increased separation of oxygenated and deoxygenated blood, allowing more efficient respiration and circulation to fuel high activity and increased oxygen demands associated with endothermy.