When blood sodium levels fall, which hormone promotes sodium retention by the kidney in mammals?
A. cortisol
B. aldosterone
C. estrogen
D. antidiuretic hormone
E. testosterone
B. aldosterone
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Four of the five answers listed below are
density-independent factors. Select the EXCEPTION.
a. nutrient supply b. temperature drop c. drought d. volcanic eruption e. hard freeze
Where is the epiglottis located?
a. above the pharynx b. below the pharynx c. below the larynx d. below the esophagus e. in the middle of the pharynx
Amniocentesis is _____
a. a surgical means of repairing deformities b. a form of chemotherapy that modifies or inhibits gene expression or the function of gene products c. used in prenatal diagnosis to detect chromosomal mutations and metabolic disorders in embryos
d. a form of gene replacement therapy e. commonly performed on newborns
Many cichlids can be similar in appearance. If species are identified by using information about diet and the water depth at which the fish swims, the _____________ species concept is being applied.
A) ecological species concept B) phylogenetic species concept C) morphological species concept D) biological species concept E) behavioral species concept