A half-life is the amount of time required ____
a. to lose half the daughter isotopes
b. for the mass of the sample to decrease by one-half
c. for half of the parent atoms to decay to daughter atoms
d. for the parent atoms to increase by one-half
e. to accurately date a rock sample
c
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Heat is a type of water pollutant
Indicate whether the statement is true or false
Salmon populations in the Columbia River have increased by 35% since the dam system was put in place.
Answer the following statement true (T) or false (F)
Grazers are well suited to savannas because
A) none of their natural predators live there. B) they are able to migrate seasonally toward the wetter areas. C) they can pull up grasses there by the roots. D) the grasses there are ephemeral.
A community that changes very little over time is said to have great
A. Connectedness B. Diversity C. Complexity D. Renewal ability E. Constancy