3. In ecology, the term "abundance" refers to the number of individual animals seen over a period of time at a particular location. The following diagram represents estimates of the eastern north Pacific gray whale based on sightings from a research station in California. Gray Whale Abundance Predicted from Sightings at Granite Canyon Research Station 30 000- 25 000- 20 000- Abundance 15 000 10 000- 1970 1960 1990 2000 Year NOAA Research a. Explain how this diagram can be interpreted. b. Can you say that the gray whale abundance was higher in 1970 than in 1971? Explain. C. Is the statement "gray whale populations have been estimated as high as 22 000 in 2008" a reasonable interpretation of the diagram