Which of the following is NOT a basic task of
all animal digestive systems?
a. nutrient absorption
b. elimination
c. digestion
d. ingestion
e. energy production
E
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CD4 molecules are found on T ________ cells, whereas CD8 molecules are characteristic of T________ cells.
Fill in the blank(s) with the appropriate word(s).
The most precise method of obtaining estimates of the absolute ages of geological deposits is
A. measure rates of sedimentary rock formation. B. measure the ratios of various radioactive isotopes in the deposits. C. apply the principle of superposition (younger deposits above older deposits). D. make salinity measurements in ocean sediment deposits. E. study the sequence of fossil types in the deposits.
Leachate
What will be an ideal response?
The study of genomes is called
a. genomics. b. genetics. c. gene sequencing. d. genetic engineering. e. DNA sequencing.