The majority of energy resources taken from the sea are in the form of:
a. coal.
b. energy from tides.
c. gas and oil.
d. energy from waves.
e. thermal energy.
C
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Claytonia virginica is a woodland spring herb with flowers that vary from white to pale pink to bright pink. Slugs prefer to eat pink-flowering over white-flowering plants (due to chemical differences between the two), and plants experiencing severe
herbivory are more likely to die. The bees that pollinate this plant also prefer pink to white flowers, so that Claytonia with pink flowers have greater relative fruit set than Claytonia with white flowers. A researcher observes that the percentage of different flower colors remains stable in the study population from year to year. Given no other information, if the researcher removes all slugs from the study population, what do you expect to happen to the distribution of flower colors in the population over time? A) The percentage of pink flowers should increase over time. B) The percentage of white flowers should increase over time. C) The distribution of flower colors should not change. D) The distribution of flower colors should randomly fluctuate over time.
The only body fluid that can transmit Hepatitis B virus is blood.
Answer the following statement true (T) or false (F)
Which of the following is true of predation?
a. A predator exerts selective pressure on its prey. b. A prey exerts selective pressure on its predator. c. In a typical predation case, the predator would not kill its prey. d. Feeding on carcasses is also an example of predation. e. Predator and prey exert selective pressure on one another.
The most objective way to construct a phylogeny is to focus on characters
A. inherited from a common ancestor. B. that confer adaptedness to a particular habitat. C. that are large in size. D. acquired during an organism's lifetime.