Which of the following is essential for birds to maintain their high metabolic rate?
A) Skin that is used as a respiratory structure
B) Hollow bones, which decrease body mass
C) Embryonic development in a shelled amniotic egg
D) A four-chambered heart, which maximizes oxygen delivery
E) Extraordinary coordination by a well-developed nervous system
D
You might also like to view...
Which of the following choices best describes the relationship that exists between moisture and air temperature?
A. The moisture-holding capacity of air decreases when it is warm and increases when it is cool. B. The moisture-holding capacity of air remains the same (warm or cool) and is not related to its temperature. C. The moisture-holding capacity of air increases when it is warm and decreases when it is cool. D. The moisture-holding capacity of air decreases as the higher altitude winds of the polar regions descend onto the continents.
What is required for facilitated transport to function properly?
a. ATP b. glucose c. glycolipids d. transport protein
Which of the following is a characteristic of a cell’s plasma membrane?
a. Having hydrophilic surfaces b. Being a static structure c. Having three layers of phospholipids d. Having hydrophilic fatty acid tails
Which of these conditions is a cancer that causes uncontrolled division of white blood cells, such that the number of cells greatly increases?
A) iron-deficiency anemia B) mononucleosis C) leukemia D) sickle-cell anemia