A frog loses its ability to undergo buccal pumping. What must happen to compensate for this loss?
A. The pumping of blood from the atria to the ventricle must increase.
B. The exchange of gases through the skin must increase.
C. The pumping of blood from the ventricle to the body must increase.
D. The diffusion of wastes through the kidneys must increase.
E. The pumping of blood from the ventricle to the atria must increase.
B. The exchange of gases through the skin must increase.
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The resident microflora that can colonize the bladder and other structures of the urinary tract are:
a. Enterobacteriaceae. b. yeast. c. Propionibacterium acnes. d. Corynebacteria.
The event in the cell division process that clearly involves microfilaments is
a. chromosome separation during anaphase. b. movement of chromosomes to the metaphase plate. c. chromosome condensation during prophase. d. disappearance of the nuclear envelope during prophase. e. cytokinesis in animal cells.
How do the various membranes of a cell differ?
a. Only certain membranes are constructed of a selectively permeable membrane. b. Certain proteins are unique to each membrane. c. Phospholipids are found only in certain membranes. d. Only certain membranes are constructed from molecules with dual solubility.
The difference-in-differences approach relaxes some of the required assumptions for establishing causality by leveraging what dimension of the empirical setting?
A. Observing repeated observations of the same cross-sectional units over time. B. Observing multiple cross-sectional units receiving the treatment. C. Being able to construct an instrument from the first stage difference. D. Observing a time series for one series.