Answer:
You should generally have one independent variable in an experiment. This is because it is the variable you are changing in order to observe the effects it has on the other variables.
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toothpaste in reducing
cavities?
How does the daytime
• temperature affect the
formation of dew at night?
Which is a better absorber
of heat, an object painted
black or the same object
painted white?
Can plants prepare food
even in artificial light?
Why does a rolling ball slow
down as it moves?
Answer:
Following questions are better answered by observational study:
- How does the daytime temperature affect the formation of dew at night?
- How effective is a new toothpaste in reducing cavities?
Following questions are better answered by controlled experiment:
- Which is a better absorber of heat, an object painted black or the same object painted white?
- Why does a rolling ball slow down as it moves?
- Can plants prepare food even in artificial light?
Explanation:
An observational study is one in which the researcher doesn't manipulate anything.
In a controlled experiment, the researcher manipulate the outcome of the experiment and controls the factors that might affect the experiment to see different results in different conditions.
So, for questions over which research do not have any control, mostly natural processes, observational study is a better option.
However, to check why a rolling ball slow down, controlled experiments are done to find out all the factors.
Plants placed in artificial light is also an controlled experiment as the researcher will himself place the plants in artificial light and keep them away from natural light.
Similarly, to check if color of the object affects the amount of heat absorbed by that object, a controlled experiment must be performed. Same object should be painted white and observed and then painted black and observed.
Answer: it's environment
Explanation:
An organism's overall behavior is a combination of its heredity and its environment. For example, both Krista and Blaire inherited a fear of thunder. They deal with this fear differently, however, because of differences in their environment.
Answer:
environment
Explanation:
Answer: To complete the process of digestion after the food is ingested by mouth.
Explanation:
The food that we eat is ingested by mouth and here the mechanical degradation of food takes place. This breaks down the food into smaller pieces.
Mouth also contains the enzyme that is responsible for the digestion of starch.
Then the food from the mouth reaches the stomach where various types of digestive juices and enzymes are secreted to digested the food.
Hence, mouth and stomach must be near in the digestive system.