Park officials needed to repair the old mill dam in a state park and so had to drain the pond behind it, killing all the animals and many of the plants in the water. After the pond reformed and many years passed, a certain species of fish established
itself in the pond and remained there for more than 400 years. Which most directly describes the role of that type of fish?
A) climax species B) invaders C) pioneer D) producers
Answer: A
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Which pressure is the distending force on the lungs?
A) rebound pressure (elastic recoil) B) atmospheric pressure C) intrapleural pressure D) transpulmonary pressure E) intra-alveolar pressure
Which of the following events is least likely to result in a genetic change in a bacterium?
A. Conjugation B. Specialized transduction C. Pilus formation D. Natural transformation E. Generalized transduction
A microorganism grows in the lab on medium containing mineral salts but no organic compounds. The organism is likely to be a(n)
A) heterotroph. B) autotroph. C) chemotroph. D) chemoheterotroph. E) The answer cannot be determined from the information provided.
Flowering plants
a. only reproduce asexually. b. produce clones through sexual reproduction, and under certain circumstances seeds through asexual reproduction. c. reproduce asexually about half the time and sexually about half the time. d. only reproduce sexually. e. produce seeds through sexual reproduction, and under certain circumstances clones through asexual reproduction.