Which situation is an example of behavioral isolation?
A) A species of daisy only blooms when nights become longer than nine hours.
B) The offspring of horses and donkeys are sterile.
C) The pollen of roses isn't recognized by the eggs of morning glories.
D) Female spiders only mate when a male of the same species taps her web in a particular way.
D
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Cadherins (select all correct choices):
A. are cell adhesion molecules found in cellular junctions at cell surfaces. B. are calcium-dependent proteins involved in attachment of cells to neighboring cells. C. are calcium-dependent proteins involved in attachment of cells to the extracellular matrix. D. are highly diverse, and each type can only bind to a complementary cadherin type.
Menstruation begins in response to ____
a. rising levels of FSH and LH b. rising levels of GnRH c. rising levels of progesterone d. falling levels of progesterone e. rising levels of estrogen
Amniotes differ from earlier vertebrates by
a. their large size. b. their three-chambered heart. c. their internal fertilization. d. the possession of a slimy skin. e. having external scales.
The liquid part of human blood that consists of water, salts, and dissolved proteins is known as
A) interstitial fluid. B) lymph. C) plasma. D) platelets.