The presence of a loop of Henle in nephrons is an evolutionary adaptation that enables mammals and birds to reabsorb water efficiently and produce a ____________ urine.
A. hypertonic
B. osmolar
C. isotonic
D. hypotonic
A. hypertonic
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Which one of the following is not a steroid that uses a type I receptor?
A. estrogen B. glucocorticoids C. thyroid hormone D. androgens
Which phylum is associated with all of these terms: asymmetry, choanocytes, filter feeding, osculum, and spicules?
a. Porifera b. Nematoda c. Ctenophora d. Nemertea
The three domain system arose when scientists grouped organisms according to how long they have been
a. alive in their present forms b. going extinct c. evolving independently d. using DNA to store information
When you estimate parameters by finding those that make the observed outcomes as likely as possible for a given model, you are using which method?
A. Instrumental variables B. Maximum likelihood estimation C. Least absolute deviations D. Generalized method of moments