The benthic community of an ocean, with the exception of hydrothermal vents, is best described as
A) completely heterotrophic and very diverse.
B) completely autotrophic and very diverse.
C) completely phototrophic and not very diverse.
D) mostly heterotrophic and not very diverse.
A
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Clostridium difficile is a bacterium that is often found in the gastrointestinal tract of healthy individuals. It is also a common cause of hospital-acquired infections
Most individuals who become ill with C. difficile do so following antibiotic treatment. This information suggests that: A. C. difficile is not pathogenic (diseasecausing) in healthy people. B. C. difficile is resistant to antibiotics and antiseptics used in the hospital setting. C. C. difficile is adapted to the human gastrointestinal tract. D. C. difficile rebels when other organisms are eliminated from their environment.
What does a producer need for performing photosynthesis, and what does photosynthesis produce?
What will be an ideal response?
Which of the following pairs of organisms is probably monophyletic?
a. Archaeans, bacteria b. Plants, fungi c. Giant sequoia trees, magnolia trees d. Dolphins, sharks e. Large cactus finch, vampire finch
Analysis of genomes of modern species indicates that the first cells were similar to existing ____.
A. viruses B. fungi C. prokaryotes D. eukaryotes E. algae