Polar bears are being affected by temperature changes because
a. these changes reduce their habitat.
b. they have less hunting success.
c. they have less available water.
d. More than one of these answers is correct
D
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What is the main reason that a person sitting on the beach with an air temperature of 15 °C loses heat less rapidly than when immersed in lake water at 15 °C?
A) Water conducts heat more efficiently than air does. B) Water evaporates, and heat is lost to evaporation. C) Metabolic heat production is greater in air than in water. D) Air is a poor insulator.
At what stage of the meiotic cell cycle and during what chromosomal configuration does crossing over occur?
What will be an ideal response?
The ability of a disease to be transmitted from one person to another or to spread through the population is called ___
a. susceptibility b. transmissibility c. zoonotic d. communicability
If a population contains 800 individuals and documents 400 cases of measles within the population, what is the prevalence rate?
A) 50% B) 80% C) 60% D) 40% E) 30%