In open-water ecosystems, decomposition occurs primarily in the
A) thermocline.
B) hypolimnion.
C) epilimnion.
D) benthic zone.
D
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Which hormone is involved in maintaining the gamete or egg cell in females?
A. estradiol B. progesterone C. gonadotropin-releasing hormone D. follicle-stimulating and luteinizing hormones E. All of the choices are correct.
Psilotum lacks
a. roots. b. a mechanism to take up water and minerals. c. vascular tissue. d. alternation of generations.
During inspiration, the diaphragm __________ and __________ the volume of the thoracic cavity, causing air to flow __________.
a. relaxes; increases; inward b. contracts; increases; inward c. relaxes; decreases; outward d. relaxes; decreases; inward e. contracts; decreases; inward
A human individual is phenotypically female, but her interphase somatic nuclei do not show the presence of Barr bodies. Which of the following statements concerning her is probably true?
A) She has Klinefelter syndrome. B) She has an extra X chromosome. C) She has Turner syndrome. D) She has the normal number of sex chromosomes. E) She has two Y chromosomes.