Problem 10 - Biology: The Dynamic Science

Question

One reason that human populations have sidestepped factors that usually control population growth is: a. The carrying capacity for humans has remained constant since humans first evolved. b. Agriculture and industrialization have increased the carrying capacity for our species. c. The population growth rate \((r)\) for the human population has always been small. d. The age structure of human populations has no impact on its population growth. e. Plagues have killed off large numbers of humans at certain times in the past.

Step-by-Step Solution

Answer

The correct answer is b. Agriculture and industrialization have increased the carrying capacity for our species.

Step 1: Disqualify Incorrect Choices

Evaluate each statement. Let's start with option a, 'The carrying capacity for humans has remained constant since humans first evolved.' Carrying capacity refers to the maximum number of individuals an environment can support indefinitely. However, it is incorrect to say that carrying capacity for humans has stayed constant, as resources and technology have evolved with human civilizations, impacting the carrying capacity. So, this option isn't correct.

Step 2: Continue Eliminating Incorrect Choices

Let's continue with option c, 'The population growth rate \(r\) for the human population has always been small.' This statement is also incorrect, as the human population growth rate has varied significantly over time. It hasn't been consistently small. Similarly, options d and e can also be eliminated. The age structure of human populations significantly impacts its population growth- a growing youthful population indicates potential for high population growth. Additionally, while plagues have indeed caused significant human mortalities at times, humans have not sidestepped population control factors simply due to past plagues.

Step 3: Identify the Correct Answer

After eliminating the other options, we're left with option b, 'Agriculture and industrialization have increased the carrying capacity for our species.' This statement is accurate. Agriculture allowed humans to settle and grow food in one place, therefore accommodating more people. Subsequent industrialization led to advancements in technology, medical care, and resource use, further increasing the carrying capacity for humans. The option 'b' is the correct answer.