Question

name:birth and death token modelbirths and deaths are always happening in a population. how does the number of births andin a population affect its size? to find out, try these missions:mission 1: make the population size stay the same over time.mission 2: make the population size increase over time.mission 3: make the population size decrease over time.1. add 14 tokens to the circle on the token model population circle sheet to start with a pop of 14 organisms.2. every year 1, 2, or 3 organisms must die and 1, 2, or 3 organisms must be born. how ma to you and your partner.• to make an organism die, remove it from the population and add it back to the cup as one death.• to make an organism be born, add one token from the cup to the circle. count th birth.3. repeat until you have modeled 6 years.4. at the end of every year, record the number of births, deaths, and organisms on t plot the number of organisms on the graph on page 13.5. at the end of 6 years, add up the total numbers of births and deaths and record column.6. after youve completed the graphs, circle your answer to complete the sentencwhen the population size stays the same over time, the total number of birth ( equals / is less than / is greater than ) the total number of deaths.when the population size increases over time, the total number of births ( equals / is less than / is greater than ) the total number of deaths.when the population size decreases over time, the total number of births ( equals / is less than / is greater than ) the total number of deaths.populations and resources—lesson 1.3—activity 2© the regents of the university of california. all rights reserved.

Explanation:

• For a stable population, the number of new organisms (births) must balance the number of organisms lost (deaths), so totals are equal.
• For a growing population, more new organisms are added than are lost, so total births exceed total deaths.
• For a shrinking population, more organisms are lost than are added, so total births are less than total deaths.

Answer:

1. When the population size stays the same over time, the total number of births equals the total number of deaths.
2. When the population size increases over time, the total number of births is greater than the total number of deaths.
3. When the population size decreases over time, the total number of births is less than the total number of deaths.