In the late 1700s, two populations of minnows became isolated when an earthquake altered the path of a river. Now the populations can no longer successfully breed with each other even when they are both moved to the same pond
These organisms have undergone ________ speciation.
Fill in the blank(s) with correct word
allopatric
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A group of individuals that can interbreed in nature and produce viable offspring would be considered to be a species according to the
A. phylogenetic species concept. B. biological species concept. C. evolutionary species concept. D. ecological species concept. E. general lineage concept.
Which of the following statements is incorrect about shigellosis?
A. It frequently complicates to sepsis. B. Outbreaks have occurred in day care centers. C. It is also called dysentery. D. Symptoms include watery diarrhea with bloody, mucoid stools and abdominal cramps. E. Human carriers cause fecal transmission.
Large amounts of oxygen gas appeared in Earth's atmosphere about ________ years ago
A) 200 million B) 1.7 billion C) 2.7 billion D) 4.5 billion
What is the light used for in Chlamydomonas?
a. as a source of information about the external environment b. as a source of information about the internal environment c. as a source of energy and as a source of information about the external environment d. as a source of energy