In a deciduous oak forest in the northeastern United States, one example of a nonliving component of the ecosystem is
A) the smaller plants living under the oak trees.
B) nematodes in the soil that feed on plant roots.
C) animals such as deer that migrate through the forest but do not eat in the forest.
D) nematodes in the soil that feed on dead organic matter.
E) sunlight that filters through the canopy.
E
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Vitamins are ________ substances and minerals are ________ substances that perform essential metabolic functions
a. inessential / essential b. organic / inorganic c. essential / inessential d. inorganic / organic
Which of the following statements regarding lichens is FALSE?
A) Lichens are a mutualistic relationship between a fungus and a protozoan. B) Lichens represent a mutualistic relationship between a fungus and an alga. C) Lichens are often the first life form to colonize rock or soil. D) The algal partner produces carbohydrates that are absorbed by the fungal partner. E) The fungal partner provides a means of attachment and protects the algal partner from desiccation.
What are the receptors called that transmit impulses that are perceived by the brain as pain?
A. baroreceptors B. chemoreceptors C. nociceptors D. thermoreceptors E. propioceptors
A human egg is approximately 100 µm in size. What is this equal to?
a. 10.0 mm b. 0.10 mm c. 0.010 mm d. 0.0010 mm