By adjusting the volume of gas in ____, a ray-finned fish can change its buoyancy so that it remains suspended at the desired depth
a. lungs
b. gills
c. bladder
d. swim bladder
e. buoyancy sac
d
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What amount of body fat is normal and healthy for a 19-year-old woman?
A) 3% B) 8% C) 10% D) 20%.
The role played by a species in its environment is called its
A. ecological niche. B. fundamental niche. C. realized niche. D. multidimensional niche. E. Hutchinsonian niche.
Theoretically, which two of the following present the richest potential sources of silica?
1. marine sediments consisting of foram tests 2. diatomaceous earth 3. marine sediments consisting of radiolarian tests 4. marine sediments consisting of dinoflagellate plates A) 1 and 2 B) 1 and 4 C) 2 and 3 D) 2 and 4 E) 3 and 4
Joe has recently lost a lot of weight, and has an increased heart rate and elevated body temperature. What gland might not be working right?
A. pancreas B. parathyroid C. thyroid D. adrenal