Species distribution can be understood through many factors except variation of sea levels.
99th Street was a local station on the demolished IRT Ninth Avenue Line .. IRT Ninth Avenue Line. IRT Ninth Avenue Line. It had 2 levels .. The lower level was built first and had two tracks and two side platforms and served local trains .. The upper level was built as part of the Dual Contracts and had one track that served express trains that bypassed this station .. Dual Contracts. Dual Contracts. It opened on June 21 , 1879 and closed on June 11 , 1940 .. The next southbound stop was 93rd Street .. 93rd Street. 93rd Street ( IRT Ninth Avenue Line ). The next northbound stop was 104th Street .. 104th Street. 104th Street ( IRT Ninth Avenue Line )