A one-way relationship in which one species
benefits at the expense of another is
a. commensalism.
b. competitive exclusion.
c. parasitism.
d. obligate mutualism.
e. a neutral relationship
C
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The complete replacement of one type of organ with another is called
a. homeotic gene replacement d. modularity b. evo-devo e. punctuated equilibrium c. homoeosis
Which of the following statements is true of the blastula?
a. It is the earliest stage of embryonic development. b. Three cell layers are evident. c. The neural tube forms. d. Limb buds may be seen. e. It is haploid.
What is the physiological cause of a heart attack?
A) rupture of coronary arteries B) a blood clot moving through the heart C) a blood clot lodging in a blood vessel supplying the heart D) scar tissue in the heart muscle
Refer to the accompanying figure. Which label indicates the location of the promoter region?
a. A
b. B
c. C
d. D
e. E