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:
I would say that the answer is A
Explanation:
Sorry if I get it wrong
Following precautions should be taken when constructing;
1)
Contractors should know about the temperature on
the work site.
2)
The unsatisfactory decision of safety measure
strategy will crumple the particular undertaking quality.
3)
There should be the availability of LP gas
heaters and blowers.
4)
Temporary workers can likewise pick poly fenced
in area installed with platform frameworks firmly.
5)
Warmth conveying punctured texture tube running
under platform will be utilized.
6)
There should be the utilization of dry mortar
rather than wet mortar in winter season.
7)
Quick setting mortar or cement Mortar setting
admixtures can be utilized.
8)
Wind should be above 25mph in wind barriers and
the temperature that is required is below 25 degree.
Carbon Monoxide would have been mostly to effect the embryo as it targets the respiration system.
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