2Life 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
3Living 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
4The 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.
5Stage 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.
6Stage 2: Growth The time following the beginning Organism is rapidly increasing in size and developing skills.
7Stage 3: Maturity The state when organism is fully developed. Carries out functions of adultsNo longer increases much in sizeHave reached reproductive potential
8Stage 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
9Stage 5: DeathProtoplasm in the cells of the organism cease to function.Chemical activity in the cells stopsOrganism is no longer alive.
10C. 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