If the population can be shown to be decreasing in size, then the lambda would be positive while the r would be negative.
When the population is decreasing, the rate would be negative because the population is shrinking. This is why r - which is rate - will be negative.
Lambda on the other hand will be positive to show that the population started from a higher value and is now decreasing.
Find out more on population models at https://brainly.com/question/25787521.
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