Which of the following is an example of a cohort study?
A) Compare lifetime exposure to coal plant emissions between individuals with lung cancer and individuals without lung cancer in the general population.
B) Measure lifetime exposure to coal plant emissions and the incidence of lung cancer in a group of individuals living in a small town.
C) Question all people in an area about their exposure to coal plant emissions and whether they have any lung diseases.
D) Examine the incidence of lung disease in all females over the age of 50 in a city by a coal plant.
B
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The ectoderm is to the central nervous system as the mesoderm is to the
A. epidermis. B. respiratory tube. C. digestive tract. D. skeletal muscle. E. peripheral nervous system.
An organism lives in an environment that is constantly changing. What type of reproduction
would be most advantageous?
a. asexual reproduction, because the organism can produce numerous clones of itself b. sexual reproduction, because new genetic combinations may provide advantages in survival c. budding, because no time or energy is expended on searching for a mate d. either asexual or sexual reproduction, because the number of offspring produced is the most important factor
The earth’s earliest atmosphere was likely composed
mostly of gaseous a. hydrogen. b. nitrogen. c. water vapor. d. carbon dioxide. e. mixtures of these.
Why would a scientist trying to isolate osteoblasts look between the periosteum and the bone in a young animal to find them?
What will be an ideal response?