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the population of trout in lake juniper was measured over one hundred years. the graph shows the population of trout over time. at which lettered point was the population growth limited by the density of trout in the lake?
a) a
b) b
c) c
d) d

Astudent poured a solution of bromothymol blue indicator into three test tubes. then he placed an aquatic plant in two of the test tubes, as shown below. he placed a stopper on each test tube and placed them all in the dark for 24 hours. bromothymol blue turns from blue to yellow in the presence of co2

The human body needs energy in order to carry out life processes such as breathing. where does the body get this energy? a. from eating food b. from learning about new things c. from lying in the sun d. from sleeping

What are the characteristics of subsystem