the current population of a threatened animal species is 1 million, but it is declining with a half-life of 20 years. how many animals will be left in 60 years?

The answer will be 177,000

nope. 60 years is 3 half-lives, so 1/8 will remain.

thank you that is also what i got. 125,000

I also got 125,000

To determine the number of animals that will be left in 60 years, we need to understand the concept of half-life and how it applies in this scenario.

The half-life of a population refers to the time it takes for the population size to decrease by half. In this case, the half-life is 20 years. This means that every 20 years, the population of the threatened animal species will be reduced to half of its previous size.

Given that the initial population is 1 million, we can calculate the number of remaining animals after each 20-year period:

After 20 years: 1 million / 2 = 500,000 animals remaining
After another 20 years (40 years in total): 500,000 / 2 = 250,000 animals remaining
After another 20 years (60 years in total): 250,000 / 2 = 125,000 animals remaining

Therefore, based on the given information, there will be 125,000 animals left in the threatened animal species after 60 years.