A horseshoe crab uses its long extended spine for what purpose?
a. defending its territory
b. digging for clams
c. fighting for mates
d. protection from predators
e. flipping itself right side up
ANSWER: e
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A ________ epidemic is characterized by a relatively slow and prolonged rise then a gradual decline in the number of individuals infected.
A. propagated B. common-source C. sporadic D. herd
The ________ is the distance between the specimen and the objective lens when the specimen is in focus.
Fill in the blank(s) with the appropriate word(s).
Answer the following statements true (T) or false (F)
1. The use of fossil fuels has increased the available resources for populations around the world, contributing to the exponential growth rate of the human population. 2. Developing countries are less likely to agree on a global climate change treaty because they might fear that it will slow their economic growth. 3. Population sizes of predators and their prey in a community are constant over time. 4. Pioneer species make up the climax community of a given ecosystem. 5. The main source of water in streams is replenished from groundwater.
Which disorder is classified a COPD?
a. emphysema b. asthma c. lung cancer d. high blood pressure e. apnea