Although the actual questions are missing from your ask, here's how you can tell.
If the study will be messed up (added bias) through interaction with the subjects the study should be observational. For example if a biologists wanted to study the eating habits of wild birds in the tropics, they would need to do an observational study. if they did a controlled experiment, the birds will change their eating habits based on human interaction, thus making the study invalid.
If the study requires specific measurements, close monitoring, or contact and interaction with the subjects the study should be a controlled experiment. For example, if a scientist wanted to test out a new drug, the health of patients would need to be closely monitored.
Hey!
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If your hypothesis is to be supported, the data should show that the hypothesis is true. If the hypothesis is unsupported then the data shows that the hypothesis is false.
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Hope This Helped! Good Luck!
Gathers simple molecules to make larger ones
Answer:
Food additives are substances added to food to preserve flavor or enhance its taste, appearance, or other qualities. Some additives have been used for centuries; for example, preserving food by pickling, salting, as with bacon, preserving sweets or using sulfur dioxide as with wine. To maintain the nutritional quality of a food - e.g. by avoiding degradation of vitamins, essential amino acids and unsaturated fats. To provide ingredients for consumers with specific nutritional requirements e.g., sweeteners in tooth friendly confectionary or bulking agents for those seeking to reduce caloric intake.
Source:
Wikipedia
I also used multiple websites saying the same thing.
Such as Food-info.net
Www.Just-Food.com
The answer would be D. A decrease in plant growth because if there is less sunlight then the rate of photosynthesis would decrease
