Genetic variation. We all have different gene expressions and often times we have different parent cells than somebody else of the same species, though, it's possible to share similar characteristics.
C. Because ecosystems consist more of animals
The right answer is higher-than-average sea levels.
With the rise in CO2 level that caused an increase in air temperature and sea surface temperatures. At this time, they were the highest ever recorded. In addition, the rise in mean sea level continued and the extent of Arctic sea ice was well below normal for most of the year.
I say D, because there are certain states that have national parks and a large tree area.
