The natural habitat of a pathogen is referred to as its
A. home.
B. primary inhabitance.
C. infectious site.
D. reservoir.
D
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Migration reduces genetic differences between populations due to gene ____ between the two
Fill in the blank with the appropriate word.
Which of the following terms does not apply to leaves?
a. parenchyma cells are primarily photosynthetic b. cactus spines c. tendrils d. petioles e. attached at internodes
In a weakened heart, the heart begins to pump less blood, resulting in blood backing up in the veins causing pressure in veins and capillaries to rise. This condition is called
A) angina. B) congestive heart failure. C) hypotension. D) hypertension. E) atherosclerosis.
Which of the following statements is true?
A. Many variable traits in a population result from the combined effect of several genes. B. Only one allele for a particular trait is considered for inclusion into the gene pool. C. Environmentally induced traits are passed on to offspring. D. Environmental influences have nothing to do with variation in phenotype within a population.