A resting heart rate that exceeds 100 beats per minute is called ________.
A) hypercardia
B) hypertension
C) tachycardia
D) bradycardia
Answer: C) tachycardia
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Which of the following statements is not true of nitrogen-fixing bacteria?
A. They live in root nodules. B. They are very common in symbioses with plants from the legume family. C. They are very common in symbioses in all plant families. D. Some are free-living in the soil. E. They provide an important way that biologically available nitrogen enters ecosystems.
Macrocystis kelp communities have numerous ____ organisms while Laminaria kelp communities have ____ organisms
a. swimming, crawling b. crawling, swimming c. benthic, pelagic d. pelagic, benthic e. benthic, crawling
Which of the following symptoms would be characteristic of a child whose mother ate fish
contaminated by PCBs during her pregnancy?
a. low birth weight and neonatal behavior problems b. low IQ and teen delinquency c. misshapen head and facial abnormalities d. spina bifida e. club foot
In Cameroon, seedcrackers have either small bills (adapted for feeding on soft sedge seeds) or large bills (adapted for
feeding on hard sedge seeds). During competition for scarce resources, these birds primarily feed on the seeds for which they are best adapted. This is an example of ____ selection.
a. stabilizing b. disruptive c. frequent d. directional e. mutational