The factors used to determine tumor grade can vary between different types of cancer. Tumor grade is not the same as the stage of a cancer. Cancer stage refers to the size and/or extent (reach) of the original (primary) tumor and whether or not cancer cells have spread in the body. Cancer stage is based on factors such as the location of the primary tumor, tumor size, regional lymph node involvement (the spread of cancer to nearby lymph nodes), and the number of tumors present.
According to an international team of scientists reporting in the Proceedings of the National Academy of Sciences, an asteroid or comet that landed in what is now the Canadian province of Quebec might have led to a significant climate change event known as Younger Dryas.
Older leaves on the corn plant will naturally turn yellow and eventually drop off of the plant, so there is no cause for concern if this is the case. Excessive or improperly applied fertilizer can cause leaf tips and margins to turn yellow or brown.Low humidity can cause dry tips and edges.assangeana is a cultivar of Dracaena fragrans, commonly known as corn plant because of its narrow, arching foliage that resembles the leaves of a corn plant. Massangeana features a large yellow stripe down each leaf center.