A population of bullfrogs in a pond produces many thousands of eggs each spring that hatch out into tadpoles. However, only about 1% of the tadpoles survive to reproduce. This population of frogs is experiencing
A) low environmental resistance.
B) low levels of recruitment.
C) unlimited population growth.
D) exponential growth.
B
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What is population density?
A) the birth rate minus the death rate B) the birth rate minus the death rate with immigration and emigration also taken into account C) the average number of people per unit area D) the amount of farmland per person E) the total number of people in urban areas, minus the number of people in rural areas
Ozone in the stratosphere primarily forms over ____ and is transferred to ____ by stratospheric winds
A) the tropics; Australia B) the tropics; the Antarctic C) North America; the Antarctic D) Europe; the Antarctic
In the Koeppen system of climate classification, generally the first letter stands for ________ and the second letter stands for ________
A) precipitation; temperature B) temperature; precipitation C) location; latitude D) latitude; location
An old friend has died from a disease that resulted from his lifelong exposure to a toxic substance. From which of these illnesses did the friend most likely die?
A) Whooping cough B) A bacterial infection C) Cancer D) Malaria