Which abiotic factor would have the most significant physiological effect on migrating salmon?
A) water solute content
B) competition for resources
C) ambient temperature
D) human-built structural interferences
Answer: A
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________ is a vitamin necessary for normal sperm formation and embryonic development
a. Folate b. Vitamin B c. Ricin d. Niacin e. Vitamin A
Which vitamin helps older women retain calcium and diminish bone loss?
a. A b. D c. C d. B12 e. K
Salmonella enteritidis causes a food-borne illness that kills 400 to 600 Americans each year. It is found mainly in poultry products
Rather than give large doses of antibiotics to poultry, some poultry producers infect the intestinal tract of hens with a harmless bacteria, resulting in a dramatic decrease of S. enteritidis found in the chickens. In this case, what principle did the producers use? A) mutualism B) predation C) competitive exclusion D) parasitism
Which of the following statements is TRUE regarding a gastrovascular cavity?
A) Ingestion and elimination occur through a single opening. B) Digestion occurs in specialized chambers. C) Digestion is unnecessary because of the small size of the particles absorbed. D) Absorption occurs within collar cells. E) Digestion is exclusively intracellular.