-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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C and D is the answer. If you were confused by the first one

Explanation:

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

the missing space is phylum