Which statement about human demographic trends is true?
A) As women's status and education increase, they choose to have more children.
B) After 1950, mortality rates increased rapidly in most developing countries.
C) A human population in which women reproduce at a later age will experience slower population growth.
D) The movement from high birth rates and low death rates to low birth rates and high death rates is called the demographic transition.
Answer: C
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Which age structure diagram would be most indicative of the African country of Kenya?
a. pyramid-shaped with a wide base b. bullet-shaped c. middle section wider than both the relatively narrow base and top d. tapering from a broad top to a narrow bottom e. base and top both wider than the constricted center
An organism with a temperature growth range of 45°C to 60°C would be called a(n) ________.
A. extremophile B. thermophile C. thermoduric microbe D. psychrophile E. facultative psychrophile
Answer questions 58–61 by using the five numbers below
a. 10 b. 20 c. 40 d. 60 e. 80 M 58. How many sperm would eventually be produced from 20 spermatids? M 59. How many sperm would eventually be produced from 20 primary spermatocytes? M 60. How many ova (eggs) would eventually result from 20 secondary oocytes? M 61. How many ova (eggs) would eventually result from 20 primary oocytes?
The situation in which an embryo produced as a
result of a mating between individuals of different species is incompatible with the mother and is subsequently aborted is an example of a. temporal isolation. b. hybrid inviability. c. mechanical isolation. d. gametic mortality. e. behavioral isolation.