The gradual change in specific human mitochondrial DNA sequences along a river illustrates
A) a founder effect.
B) a population bottleneck.
C) a cline.
D) spontaneous mutation.
C) a cline.
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It is through ____ that we further our knowledge of living things
a. ideologies b. biological research c. philosophy d. ethics e. logic
During which phase does crossing-over occur?
a. interphase b. prophase I c. metaphase I d. prophase II e. metaphase II
The ancestors of land plants were probably ________ that lived in ________
A) green algae similar to charophytes; the open ocean B) green algae similar to charophytes; coastal marshes or lake fringes C) cyanobacteria; coastal marshes or lake fringes D) cyanobacteria; moist soil crust communities
Organisms that require organic sources of carbon and energy are called (chemoheterotrophs/chemoautotrophs/autotrophs)
What will be an ideal response?