Tonga has the following population statistics: growth rate = 0.7%
crude birth rate = 24%
crude death rate = 6%
emigration = 40.9%
What is the immigration rate of the population in
Tonga?
HINT: (CBR + Immigration) - (CDR + Emigration) = Population Growth Rate
A. -22.4%
B. 17.6%
C. 23.6%
D. -10.3%

Which of the following best describes the expensive tissue hypothesis? brains require more energy, so the gut had to be reduced, and larger brains and tool use led to higher quality diets. increasing body size means that homo neanderthalensis had to include more fat in its diet. brains require more energy, so the gut had to be reduced as brains got bigger. brains require more fat, so the gastrointestinal viscera (gut) had to expand, and hands were needed to acquire more food.