The radioactive decay of an isotope can be best compared to a ____
a. clock
b. radio
c. mp3 player
d. metronome
e. microwave oven
ANSWER: a
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A scientist measured heritability in yield per acre of a strain of wheat grown on a farm in Eastern Europe and determined that it was 80%. She can therefore conclude that:
A. 80% of variation among individuals when the same strain of wheat is grown in Nebraska will be due to genetic differences. B. 80% of variation among individuals when the same strain of wheat is grown on the same farm the following year will be due to genetic differences. C. when the same strain of wheat is grown on two different farms at the same time, 80% of the average difference in yield per acre will be due to genetic differences among populations. D. All of these choices are correct. E. None of these choices is correct.
Describe how to take someone’s hematocrit.
What will be an ideal response?
The process by which a fertilized egg becomes a distinct organism is called The process by which a fertilized egg becomes a distinct organism is called
A. epigenesis. B. cellular dedifferentiation. C. involution. D. embryonic development. E. metamorphosis.
Several groups of protists have variable modes of nutrition: Some species are photoautotrophs, whereas close relatives are heterotrophs. Such diversity even exists within a single species in some cases. Evidence suggests that this pattern is a result of the __________.
Fill in the blank(s) with the appropriate word(s).