Which of the following correctly lists the three stages of labor, in the proper order?
A) dilation, expulsion, delivery of the placenta
B) dilation, crowning, expulsion
C) contractions, dilation, expulsion
D) contractions, dilation, crowning
A
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a. are limited by only one factor at a time. b. increase arithmetically. c. increase indefinitely. d. are limited by the carrying capacity. e. are represented by a minimum of two different sizes.
The mechanism for excreting nitrogenous waste in aquatic animals was ineffective on land because
A) land animals concurrently developed a more efficient reproduction system. B) land animals found better food sources. C) land animals had a more difficult time with water balance than aquatic species. D) aquatic animals did not have as much protein in their diets as did land animals.
Poultry products are a likely source of infection by
A) Helicobacter pylori. B) Salmonella enterica. C) Vibrio cholerae. D) Shigella spp. E) Clostridium perfringens.
When we metabolize our food, we produce heat that helps to keep us warm. Which of the following best describes why?
A) Producing ATP from ADP is exothermic; therefore, energy is released in the form of heat. B) When we break down food, all energy in the food is directly released in the form of heat. C) When we break down our food, the reactions are not 100 percent efficient; therefore, energy is lost as heat. D) Chewing is exothermic; therefore, energy is released in the form of heat when we eat food.