Question

Blood osmolalities and the adaptable ranges of environmental salinities of two types of animals are shown in the graph below.

Mark the correct descriptions of these animals.

A. Type I animals maintain more of less stable internal osmolality by physiological means.

B. Type II animals maintain blood osmolality within narrow physiological ranges under different salinity conditions.

C. Type I animals are not likely to be found in estuaries or river mouths where fresh and salt water meet and the salinity fluctuates greatly.

D. Type II animals gain and lose water at equal rates and have no need to expend energy expelling water or salt from the body

• A. A and B
• B. B and C
• C. C and D
• D. A and D

Answer 1

Answer: (D)

A and D