Answered: A researcher wanted to know if…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Question

A researcher wanted to know if introduced predators (lake trout, a fish) caused a decrease in the abundance of yellow-legged frogs. The ecologist measured the density of frogs (number frogs per meter of shoreline of a lake) in lakes that did not have any introduced predators (fish absent), lakes that had previously introduced predators (fish present), and lakes from which he removed the predators (fish removed), and then recorded if frog density increased, decreased, or stayed the same over one year.

part a:

What was the role in the experiment of the “fish present” lakes?

Group of answer choices

A. subjects

B. experimental group

C. positive control group

D. negative control group

E. standardized condition

part b:

This study focused primarily on ______________ ecology.

Group of answer choices

A. organismal

B. population

C. community

D. physiological

E. biosphere

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