Edwin

YES

1. Community
2. SAT Questions and Feedback
3. A "How much you've improved" statistic

It's because 'population' is the subject of the sentence, rather than species. 'of the same species' is extraneous so ignore extraneous phrases that are not needed when doing this type of stuff.

1. Community
2. Study Group
3. Can you help understand this SAT question about plural v singular?