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How many great mass extinction have occurred on Earth?

_____ is the seed leaf of a flowering plant embryo.

____ is the conversion of ammonium to nitrates.

_____ is the number of individuals per unit area.

_____ succession occurs when a new community develops in a disturbed site where the soil that supported a previous community remains.

_____ is the conversion of a grassland or woodland to desert.

True or False:  The sink is a region of plant tissue where sugars are being produced or released from storage.

_____ is soil with roughly equal amounts of sand, silt, and clay.

Which process occurs when two species compete for a limiting resource, and one drives the other to local extinction?

Which of the following would be vascular tissue of the plant tissue?