When the life cycle of a disease agent is dependent on a single host species, the pathogen can be eradicated
Indicate whether the statement is true or false.
Answer: TRUE
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A survey reveals that 25 percent of a population of 1,000 individuals have attached earlobes (are homozygous recessive for the trait). For the following questions, assume that the population fits the parameters of the Hardy-Weinburg law. What is the frequency of the recessive allele?
a. ?0.75 b. 0.75 c. ?0.50 d. ?0.25 e. 0.25
Where is partial pressure of CO2 the highest?
a. atmosphere b. skeletal muscle c. capillary bed in alveolus d. alveolus (lung air sac)
On the basis of nutrient content, a lake that has received large amounts of runoff from farms, feedlots, or sewage is classified as a(n) ________ lake
Fill in the blank(s) with correct word
You observe that two sympatric species occupy different ecological niches. What kind of barrier originally caused their speciation?
A. prezygotic B. not enough information C. postzygotic