Which group of bacteria would you expect to find in a shallow clear hot spring with high concentrations of geochemically produced hydrogen sulfide?
A) purple sulfur bacteria.
B) single-celled Cyanobacteria.
C) dissimulative sulfate-reducing bacteria.
D) symbiotic diazotrophs.
Answer: A
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Some vertebrates like frogs and humans do not have a conspicuous tail, yet even humans have the remnant of one known as the:
A. sacrum B. lumbar C. spina bifida D. fundus E. coccyx
The chromatids detach from one another and
become visibly separate chromosomes during a. anaphase. b. metaphase. c. interphase. d. prophase. e. telophase.
A pair of centrioles is found at the center of the microtubule-organizing center in plant cells
__________________ Indicate whether the statement is true or false.
At the end of the ________ period, over 96% of marine species and many terrestrial species became extinct, possibly because intense volcanic activity warmed Earth's climate
A) Quaternary B) Permian C) Cretaceous D) Devonian