The rocky area at the bottom of the photo would be considered which section of a soil profile?

A) unconsolidated material
B) subsoil
C) topsoil
D) organic layer


A

Biology & Microbiology

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Gierer and Schramm isolated ______ from tobacco mosaic virus and applied it to plant tissue, which caused the same types of lesions that occurred when plants were exposed to intact tobacco mosaic virus

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Biology & Microbiology