Question

it was originally estimated by scientists that the carrying capacity of humans on earth was approximately 1 billion people. the population of earth is now over 7 billion people. what is the best explanation for this.
humans now consume less resources than they did previously.
the earth has continued to grow at the same rate as the human population has.
humans have become more efficient in producing and replenishing food resources.
humans have greatly exceeded their carrying capacity.

answer the following questions in paragraph form and complete sentences. use the following vocabulary: limiting factor(s), carrying capacity, population and births.

1. in the graph below identify what the carrying capacity \k\ is.
2. identify when the population exceeds \k\
3. make a prediction for why the population does not start directly at \0\

white tail deer population

Explanation:

Multiple - Choice Question

• Option 1: In reality, as the human population has grown, the consumption of resources per person has generally increased (e.g., more energy use, more food consumption in many regions), so this option is incorrect.
• Option 2: The Earth's physical size (in terms of habitable land, etc.) has not grown at the same rate as the human population. The Earth is a fixed - size planet, so this option is wrong.
• Option 3: Humans have made advancements in agriculture (e.g., green revolution, use of fertilizers, improved crop varieties) and other resource - related technologies. This has allowed us to produce more food and manage resources more efficiently, which has increased the Earth's carrying capacity for humans. This option is correct.
• Option 4: While the human population has grown, the increase in carrying capacity due to technological and resource - management advancements means that we have not simply exceeded the original carrying capacity estimate in a way that would lead to immediate collapse. The original estimate was made without considering future technological changes, so this option is not the best explanation.

Carrying capacity (\(k\)) is the maximum population size of a species that an environment can sustainably support, considering the limiting factors (such as food, water, space, and other resources) available in that environment. In a population - growth graph (like the White - Tail Deer Population graph, which is likely a logistic growth curve), the carrying capacity \(k\) is the horizontal asymptote or the population size that the graph approaches and stabilizes around over time. This is because the limiting factors in the environment will restrict the population from growing infinitely. For example, if there is a limited amount of food in the deer's habitat, the population cannot grow beyond the number that the available food can support.

When the population size (of the white - tail deer, in this case) is plotted on the graph, it exceeds \(k\) when the data points (or the curve representing the population) rise above the horizontal line (or the value) that represents the carrying capacity \(k\). This occurs when the population growth, which may be exponential in the early stages (before limiting factors become very strong), outpaces the ability of the environment to provide resources (the limiting factors start to have a stronger negative impact, but for a short time, the population can still grow beyond \(k\) before potentially crashing or adjusting back to \(k\)). For example, if there was a sudden influx of food (a temporary reduction in the limiting factor of food) that allowed the deer population to grow rapidly, it might exceed \(k\) before the normal limiting factors (like competition for the now - depleted food, or predation) bring it back down.

Answer:

C. Humans have become more efficient in producing and replenishing food resources.

Short - Answer Questions

1.