Final answer:
A population with a birth rate equal to the death rate will have a stable size. To find populations with decreasing sizes, look for species with higher death rates than birth rates. Specific instances require examining life tables or given demographic data.
Step-by-step explanation:
The question asks which population would be expected to remain stable in size. According to demographic characteristics, a population with a birth rate equal to the death rate will have a stable size because the number of individuals entering the population (births) matches the number leaving (deaths). Therefore, the correct answer is c) A population with a birth rate equal to the death rate.
Examining the table provided to identify populations experiencing a negative change, we'd ideally look for species with higher death rates than birth rates. Without specific numbers, I would analyze the trend described in the options given, to conclude on the hypothetical species. Since equal birth and death rates result in stability, and populations decline when death rates are higher, looking at data on specific species' birth and death rates would reveal which are decreasing in size.
If we apply this knowledge to hypothetical data in the form of life tables, we could predict such changes. For example, if species A has a lower birth rate compared to its death rate, then it would be experiencing a negative change in population size.