Two organisms that both benefit from each other are in a symbiotic relationship called
A) ammensalism.
B) commensalism.
C) mutualism.
D) parasitism.
Answer: C
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The inner cell mass of the blastula forms:
A. a bilaminar embryo consisting of the epiblast and the hypoblast. B. a trilaminar embryo consisting of the epiblast, the mesoblast, and the hypoblast. C. a gastrula consisting of a trilaminar embryo. D. a trilaminar embryo consisting of ectoderm, endoderm, and mesoderm. E. a bilaminar gastrula consisting of the epiblast and the hypoblast.
Mechanoreceptors are located in
a. internal organs. b. skin. c. joints. d. tendons. e. all of these.
Which structure receives blood from the systemic circuit?
A) left ventricle B) pulmonary veins C) right ventricle D) left atrium E) right atrium
The most precise method of obtaining estimates of the absolute ages of geological deposits is to
A. apply the principle of superposition (younger deposits above older deposits). B. measure the ratios of various radioactive isotopes in the deposits. C. measure rates of sedimentary rock formation. D. make salinity measurements in ocean sediment deposits. E. study the sequence of fossil types in the deposits.