In a population being studied over a limit of time, four eggs hacth, six birds leave the area, three are eaten by cats, and five move into the area. What is the population change over the period of study?
A. An increase of 2 birds.
B. A decrease of 4 birds.
C. A decrease of 2 birds.
D. The population size did not change.
Hypothesis #1:
D: 6+4=10-6=4-3=1+5=6
Hypothesis #2:
A: 6+4=10-3=7+5=12
Please help me decide.
It looks to me as though the area has gained 9 birds and lost 9 birds.
AHA! SO D IT IS!!!
Anyway have a great night guys girls Ms. Sue see yous tommorow I hope.
You're very welcome, Kaled.
To determine the population change over the period of study, we need to calculate the net change in the population by considering the different factors that affected it. Let's go step by step:
1. Four eggs hatch: This means that four new birds are added to the population.
2. Six birds leave the area: This implies a decrease in the population by six birds.
3. Three birds are eaten by cats: This leads to a further decrease in the population by three birds.
4. Five birds move into the area: This results in an increase in the population by five birds.
To calculate the population change, we can simply add or subtract these numbers accordingly:
Initial population + Eggs hatched - Birds leaving - Birds eaten + Birds moving in = Final population
Now let's evaluate the two hypotheses:
Hypothesis #1 suggests that the population change is as follows:
Initial population + Eggs hatched - Birds leaving - Birds eaten + Birds moving in = 10 + 4 - 6 - 3 + 5 = 10
Hypothesis #1 concludes that the population size did not change. However, we need to recheck our calculations.
Hypothesis #2 suggests that the population change is as follows:
Initial population + Eggs hatched - Birds leaving - Birds eaten + Birds moving in = 10 + 4 - 6 - 3 + 5 = 10
Hypothesis #2 concludes that the population increased by 2 birds.
Upon recalculation, both hypotheses result in the same population change of an increase of 2 birds.
Therefore, the correct answer is A. An increase of 2 birds.