Even a small amount of lead can kill cattle. Cattle will readily drink crankcase oil, lick grease from machinery and chew on lead plumbing and batteries. Other frequent causes of poisoning include flaking high lead paint, ash from fires in which lead materials were burnt, lead shot from shooting.
life cycle. 1  The series of changes in the growth and development of an organism from its beginning as an independent life form to its mature state in which offspring are produced. 2  The sequence of events between the start of one generation and the start of the next.
The Cell Cycle. The life span of a eukaryotic cell is called the cell cycle. A cell spends the bulk of the cell cycle in interphase. During interphase, the cell grows (G1), replicates its DNA through DNA synthesis (S) and grows again (G2) until it is ready to divide.