The most likely explanation for showing fewer organisms at each feeding level going up the pyrmaid is that

Graphs you see question 5 options: the change in data over time the relationship between different dependent variables the relationship between the independent variable and the dependent variable/s the relationship between different independent variables

Which is one example of a phenotypic change that is not genetic

In general, characteristics that an organism survive and reproduce become more common in a population over time. what mechanism of evolution cause this change?