Which of the following is a shortcoming of the biological species concept?
a. Difficult to classify asexual species
b. Difficult to determine when one species has changed into another
c. Classifying ring species
d. Classifying hybridizing species.
e. All of the above
Ans: e. All of the above
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Fluorescence microscopy has been helpful in observing:
A. attachment of pollen grains to the anther B. pollen tube development in the style C. time involved in pollen release from anthers D. location of pollen within the anther E. The size of pollen grains
Radiometric dating ____
a. is based on the premise that each isotope decays at a constant rate b. is unpredictable because of changes in temperature and pressure c. can be used to date sedimentary rock, but not fossils d. has a substantial error factor e. can only be used for dating animal fossils
Exon shuffling occurs during _____
A) splicing of DNA B) DNA replication C) meiotic recombination D) translation
There is strong evidence that archaic Homo sapiens migrated to the Americas.
a. true b. false