Sea cucumbers have an Incomplete gut
a. true
b. false
Answer: b. false
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The probability that two random events will occur together is equal to the __________
a. sum of their individual probabilities b. difference between their individual probabilities c. product of their individual probabilities
Each species in a community has its own __________, or way of living. Fill in the blank(s) with the appropriate word(s)
Minick Rosing's analysis of microscopic globules of carbon found in rocks 3.7 billion years old showed that they were somewhat higher in 12C as opposed to 13C. This is significant because ________
A) 13C radiometrically decays into 12C, which lets us calculate the age of these rocks B) life could not have arisen in an environment with excessive 13C C) these carbon globules contain visible remains of cell walls and nuclei D) living things that fix carbon preferentially incorporate 12C over 13C E) meteorites must have brought 13C to the early Earth
Neurological diseases that result from West Nile virus infection include which of the following?
a. aphasia b. encephalitis c. encephalitis and meningitis d. meningitis and West syndrome