Answer:
This is an controlled experiment because he is only changing the amount of carbon dioxide in the air. Since he is only changing one variable at a time and comparing it to a natural, unaltered tomatoe area, his experiment is controlled.
Explanation:
The definition of a controlled experiment is a test where the person conducting the test only changes one variable at a time in order to isolate the results. An experiment where all subjects involved in the experiment are treated exactly the same except for one deviation is an example of a control experiment.
Answer:
Some animals have pouches to carry babies.
The babies are warm and are also protected from danger in their mother's pouch. Some animals have pouches to carry babies. Kangaroos are called marsupials because they have a special pouch for their babies.
Explanation:
I hope it helps you btw Can I get a brainliests please ☺️
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