Question

get it? describe two reasons why a species might not be able to expand its range. identify four main factors in a populations growth rate. factors in a populations growth rate compare the general shapes of the curves of population growth graphs. draw the appropriate graph. label the lag phase, exponential growth phase, and carrying capacity. below each graph, describe what the graph shows. exponential population growth logistic population growth

Explanation:

1. Reasons a species might not expand its range:

• Limited resources: If a species depends on specific food sources, water, or shelter that are not available outside its current range, it cannot expand. For example, a plant species may require a certain type of soil that is only found in its current area.
• Competition and predation: If a species faces strong competition from other species or high - levels of predation in areas outside its current range, it may not be able to establish itself. For instance, a small rodent species may be out - competed by larger rodents or heavily preyed upon by predators in new areas.

1. Four main factors in a population's growth rate:

• Birth rate: The number of new individuals born into the population over a given time period. Higher birth rates generally lead to faster population growth.
• Death rate: The number of individuals that die in the population over a given time period. Lower death rates contribute to population growth.
• Immigration: The movement of individuals into the population from other areas. It can increase the population size.
• Emigration: The movement of individuals out of the population to other areas. It can decrease the population size.

1. Comparison of population growth curves:

• Exponential population growth: The graph is a J - shaped curve. In the beginning (not always explicitly labeled as a lag phase in pure exponential growth), the population is small. As the population grows, it enters the exponential growth phase where the growth rate is proportional to the current population size. There is no carrying capacity in pure exponential growth. The graph shows a population growing without any constraints, with the population size increasing at an ever - faster rate over time.
• Logistic population growth: The graph is an S - shaped curve. The lag phase is the initial period where the population is adjusting to the environment and growing slowly. Then, it enters the exponential growth phase where the population grows rapidly. As the population approaches the carrying capacity (the maximum number of individuals the environment can support), the growth rate slows down and eventually levels off at the carrying capacity.

Answer:

1. Reasons a species might not expand its range: Limited resources; Competition and predation
2. Four main factors in a population's growth rate: Birth rate; Death rate; Immigration; Emigration
3. Comparison of population growth curves:

• Exponential population growth: J - shaped curve, no carrying capacity, grows without constraints.
• Logistic population growth: S - shaped curve, has lag phase, exponential growth phase, and carrying capacity.