©McGraw-Hill EducationWhich statement best describes the correlation between beak depths and the dryness of the environment?
A. Birds with large beaks are favored during dry years.
B. Birds with either size beak (large or small) are favored equally.
C. Birds with small beaks are favored in dry years.
D. Birds with large beaks are favored during wet years.
Answer: A
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Evolutionary biologists often use the 16S rRNA gene sequences of prokaryotes to determine genealogical relationships between them. Because these sequences are highly conserved, differences between them are notable and useful for this kind of analysis. While sequencing bacterial endosymbionts from various plants in 1992, results showed that some of these bacteria displayed a lot of similarity in their rRNA sequences, others less, and others very little similarity. The scientists determined that the most likely explanation was that those with the most similarity shared a more recent common ancestor than those with less similarity. Which principle did the scientists use to arrive at this conclusion?
a. conductive reasoning b. natural selection c. maximum parsimony d. proteomics
When all genotypes within a population do not have equal rates of survival, then allele frequencies may change from one generation to the next by a process called ________
Fill in the blank(s) with correct word
What is the land mass labeled as 1 in the accompanying figure?
a. Pangea b. Eurasia c. Laurasia d. Gondwana e. Antarctica
The liquid portion of blood that contains metabolites, wastes, hormones, ions, and a variety of proteins is called the ________.
A. edema B. platelet C. eosinophil D. plasma E. lymph