Comparative embryology helped clarify the relationships among major groups of animals. Bilaterians, for example, are (select all that apply)
A. diploblastic
B. triploblastic
C. coelomate
D. acoelomate
E. protostomate
B
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The rate of molecule movement in electrophoretic gels depends on three parameters of molecular structure
Each of these parameters individually is important in determining how a particular molecule migrates, but they can also interact with one another to produce a characteristic migration rate for each molecule. What are the three parameters?
Finding the ________ virus in chickens established the first association between viral infection and cancer
Fill in the blank with correct word.
The northern elephant seal was hunted almost to extinction during the 18th and 19th centuries. Less than 100 seals were left to contribute to the gene pool of their future generations. Since the early 20th century, the elephant seals have been protected by law in both the U.S. and Mexico. Over 100,000 seals now inhabit the western shores of North America, all related to the small population that survived the slaughter of hunters.Scientists fear the elephant seals may be more susceptible to disease and pollution due to
A. founder effect. B. disruptive selection. C. heterozygous advantage. D. bottleneck effect.
Which of the following is an example of an effect of natural selection.
A. all of the children of two parents are male. B. carbon cycles through ecosystem. C. favorable environmental conditions cause an increased food supply. D. polar bears have white fur.