Alveoli are the respiratory surfaces of birds
Indicate whether the statement is true or false.
ANSWER: False - parabronchi
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__________, the first vertebrates able to complete
their life cycle on dry land, have water conserving skin and kidneys, and amniote eggs. Fill in the blank(s) with the appropriate word(s).
Which of the following is a purine base found in nucleotides?
a. uricil b. steroid c. guanine d. cytosine e. thymine
The European Neanderthals were replaced about 34,000 years ago by
A. Homo erectus. B. Homo habilis. C. Homo heidelbergensis. D. Cro-Magnons. E. Neanderthals.
What do the alveoli of mammalian lungs, the gill filaments of fish, and the tracheoles of insects all have in common?
a. They use a circulatory system to transport absorbed O2. b. Their respiratory surfaces are invaginated. c. They function using countercurrent exchange. d. They have a large, thin surface area for gas exchange. e. All of the listed responses are correct.