2 Life SpanLive span is the period of life for an organism. It is the length of time between birth and death.Based on the average amount of time an organism livesHumans = 75 years in U.S.Cattle = years
3 Living ConditionLiving condition: is the ability of an organism to carry out life processes, needed for protoplasm to function.7 Processes needed to remain alive:Getting and using foodMovementCirculationRespirationGrowth and repairSecretionSensationSome have 2 more processesReproductionLactation
4 The 5 Stages of LifeAll organisms have a definite sequence of stages of lifeA. Stages of Life: developmental periods with common characteristics that represent various conditions of the organism.B. These stages are recognized in most animal’s lives.
5 Stage 1: Beginning The start of an organism’s life. With mammals, begins with conception or birth, depending on calculation.Age begins with day of birth.Living organism starts forming at conception.
6 Stage 2: Growth The time following the beginning Organism is rapidly increasing in size and developing skills.
7 Stage 3: Maturity The state when organism is fully developed. Carries out functions of adultsNo longer increases much in sizeHave reached reproductive potential
8 Stage 4: Decline The stage of life that follows maturity Organism has lived past maturity and begins to lose the ability to maintain itselfCells are no longer repaired and replacedAssociated with aging
9 Stage 5: DeathProtoplasm in the cells of the organism cease to function.Chemical activity in the cells stopsOrganism is no longer alive.
10 C. An example: The Horse Stage 1: Conception Stage 2: During the first 2-3 years of lifeStage 3: years following growthStage 4: Horse starts losing teeth, bone problems, deteriorationStage 5: Death follows when horse stops breathing