When echinoderms move in a manner such as walking or crawling, they pump sea water through a series of internal body canals. The water is used to inflate some of the tube feet, causing them to expand. In many species, the tube feet are equipped with suc(k)ers that grip onto the sea floor.
C. Trawling
I just answered that question, trawling is the correct answer
The question, which is what the researcher wants to know, could be the following: <em>What is the effect of the change in </em><em>available</em><em> </em><em>food</em><em> </em><em>sources</em><em> on the</em><em> birds' feeding habits</em><em>?</em>
<h3>What are the steps of the scientific method?</h3>
There are different steps to follow in a scientific method
- Definition and problem statement. The question for which there is no answer yet. A question the investigator wants to answer.
- Goal specification. The goal is what the investigator wants to know.
- Hypothesis formulation. The researcher hypothesizes in order to predict what is going on or what is expected to occur.
- Experiment. Different variables influencing the project are considered. Data collection and analysis stages. This step involves testing the observations.
- Discussion and hypothesis verification. This step involves the deriving of the working hypothesis.
In the exposed example, the experiment involves watching the birds feed, and then removing fruit to simulate an environmental change.
The independent variable here is the food source availability.
The dependent variable is the birds' response to the change.
The question, which is what the researcher wants to know, could be as follows,
What is the effect of the change in available food sources on the birds' feeding habits?
You will learn more about the scientific method at
brainly.com/question/8483218
brainly.com/question/16172865
brainly.com/question/7508826
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Low emigration , Hight emigration
