-800,000 -600,000
-200,000
o
-400,000
Year
Which two trends do the data show?
A. Annual global temperatures are very steady, with no natural
variation
B. Any present-day increase in global temperatures must be part of a
natural heating cycle.
I C. There are natural cycles of warmer and cooler global
temperatures.
✓ D. There have been multiple periods of warmer-than-average
temperatures in the past.
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Aresearcher designed an investigation to test what effect eating different types of food would have on blood insulin levels. she selected 10 male subjects who were all 25 years of age and in good health. the experiment took place over 3 days. at 8: 00 a.m. on each day, the subjects ate a meal consisting of only 1 type of food. they had their blood insulin levels measured after consuming the meal. on day 1 they ate a high fat diet, on day 2 they ate a high protein diet, and on day 3 they ate a high sugar diel what is the independent variable in this experiment? a the age of the subjects b the blood insulin level c the type of food consumed d the time of day the meal was consumed

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