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.
Water/Fertilizer. Underwatering or overwatering causes Dracaena leaves to turn yellow and drop. Only water plants if the surface soil is dry. When watering, add water until it runs out of the drainage holes in the bottom of the pot.Repeat, after a few minutes, until the water runs out of the holes again.pider mites are tiny creatures less than 1/20th of an inch long that live in colonies on the undersides of Dracaena leaves. They damage plants by feeding on the sap. Leaves become speckled with dots and later turn yellow and fall off. Spider mites produce a fine web on leaves and twigs.