Question

vernon is studying the population of deer in a tract of forest. he gathers the following data. birth rate - 50 deer/year death rate - 70 deer/year which additional observation would support the conclusion that the deer population is not changing size from year to year, meaning that the net population change is 0? a about 20 deer per year immigrate to the tract of forest. b about 20 deer per year emigrate from the tract of forest. c the average life - span of a member of the deer population is 20 years. d if a deer survives its first year of life, its average life - span is 20 years.

Explanation:

Net population change is calculated as (Births - Deaths)+(Immigration - Emigration). Given births = 50 and deaths = 70, there is a natural decrease of 20. To keep the population stable, 20 deer need to immigrate to balance this loss.

Answer:

A. About 20 deer per year immigrate to the tract of forest.