What is a practice in which a family produces enough food to feed itself, accounting for nearly 50% of tropical
deforestation?
a. monoculture
b. subsistence agriculture
c. slash-and-burn agriculture
d. cattle ranching
e. subsistence ranching.
b
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Which of the following scenarios would provide the most relevant data on population density?
A) Count the number of nests of a particular species of songbird and multiply this by a factor that extrapolates these data to actual animals. B) Count the number of pine trees in several randomly selected 10-meter-square plots and extrapolate this number to the fraction of the study area these plots represent. C) Use the mark-recapture method to estimate the size of the population. D) Calculate the difference between all of the immigrants and emigrants to see if the population is growing or shrinking. E) Add the number of births and subtract the individuals that die to see if the population's density is increasing or decreasing.
The side group (R group) of the amino acid shown above contains which of the following functional
groups?
a. hydroxyl b. carbonyl c. carboxyl d. sulfhydryl e. amino
Body appendages as diverse as crab legs, beetle legs,
sea star arms, butterfly wings, fish fins, and mouse feet start out as a. clusters of cells in the limb buds. b. cerebral cells. c. cardiac cells. d. offshoots of the sperm cell. e. offshoots of the egg.
Habituation and sensitization are simple forms of learning in which there is not an association between
A. the stimulus and the response. B. imprinting and classical conditioning. C. the fixed action pattern and the sign stimulus. D. operant conditioning and cognitive behavior.