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yaroslaw [1]
3 years ago
9

A student creates a model of a closed ecosystem by filling a glass tank half full with water, then adding 10 snails and two smal

l aquatic plants. The next day, all the snails are dead. Which action would have been most likely to keep the snails alive?
A. Adding more plants
B. Adding nitrogen
C. Adding more water
D. Adding another animal species
Biology
2 answers:
Kaylis [27]3 years ago
6 0

the answer is A. adding more plants (apex)

Natali5045456 [20]3 years ago
4 0
Well, the snails probably can't live in water, so what they needed was oxygen. 
well it's not A, not C and not D.
The answer is most likely B
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The outcome variable, test variable, and controlled variable for each question is as follows:

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<h3>What are variables in an experiment?</h3>

A variable is any factor in an experiment that can be manipulated, controlled for, or measured.

There are three types of variables in an experiment:

  • Dependent variable or outcome variable
  • Independent variable or test variable,
  • Constant variable or controlled variable

The Dependent variable or outcome variable depends on changes in the independent variable.

An independent or test variable is the variable that stands alone and is not affected  by other factors in the experiment.

The constant or controlled variable is unchanged.

The outcome variable, test variable, and controlled variable for each question is as follows:

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In conclusion, changes done to the test variable results in changes in the outcome variable.

Learn more about test variable at: brainly.com/question/25223322

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