Two categories of organic compounds typically provide energy for living systems. Representatives of these two classes are
A) lipids and proteins.
B) carbohydrates and lipids.
C) carbohydrates and nucleic acids.
D) carbohydrates and proteins.
E) proteins and nucleic acids.
D
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The diaphragm is responsible for what?
a. pushing on the lungs during exhalation b. pulling on the lungs to inflate them c. creating negative pressure around the lungs d. creating positive pressure around the lungs
The ABC genes in the model of Arabidopsis flower development are organ-identity genes that arealso:a
segmentation genes. b. homeotic genes. c. gap genes. d. translation factors genes. e. growth factor genes
The structure that transports sperm cells from the epididymis to the urethra is the
A. vas deferens. B. ductus arteriosus. C. semen. D. prostate tubules.
Since the beginning of the twentieth century, the rate at which CO2, CH4, and nitrogen oxides have been released into the atmosphere has outpaced the rate at which they can be recycled. Thus these ________ ________ are accumulating in Earth's atmosphere and are correlated with an increase in the global annual-mean surface air temperature.
What will be an ideal response?