Question 1
A researcher is recording and monitoring data about a population of plankton-eating fish. When she analyzes the data, she notes a population change that starts at point D.
image 70082d94d4a84672bcb04fa07efec956
Which is the best prediction to test in an investigation to explain why the population changed at point D?
a
The fish entered into a mutualistic relationship with another organism.
b
People released an invasive species of fish into the ecosystem.
c
The number of predators in the area has decreased.
d
Increased water clarity caused an increase in plankton density.
Question 2
Scientists study a population of crop pest insects in wheat farmlands. They create a graph of the population data, shown.
image 81e0e6a2e7c340c0acc04fe4cde0db6d
When does the insect population show it has reached carrying capacity?
a
July
b
February
c
September
d
August
c
The insect population shows it has reached carrying capacity in September, where the graph levels off and reaches a steady state.
can you answer both questions
Sure! For question 1, the best prediction to test in an investigation to explain why the population changed at point D would be:
d. Increased water clarity caused an increase in plankton density.
For question 2, the insect population shows it has reached carrying capacity in:
c. September.