Why do lymph nodes swell during an infection?
a. Macrophages accumulate in them.
b. Bacteria accumulate in them.
c. T cells accumulate in them.
d. Production of lymphatic fluid increases.
e. Production of mucous increases.
ANSWER: c
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What is one of the most damaging issues in freshwater systems that has caused the highest number of declines in fish?
A) pollution B) dams C) climate change D) ozone depletion
Identify all answer choices that best complete the question. ______________ include cells from humans, animals, plants, protozoa, fungi, and most algae
Fill in the blank(s) with correct word
Water has extraordinary properties to support life such as the capacity to:
A) dissolve a very limited number of substances B) evaporate easily at relatively low temperatures C) form hydrogen bonds with up to four other water molecules D) prevent forming interactions with many other chemicals
Habituation and sensitization are simple forms of learning in which there is not an association between
A. the stimulus and the response. B. imprinting and classical conditioning. C. the fixed action pattern and the sign stimulus. D. operant conditioning and cognitive behavior.