Answer:
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Answer is Mass number of
9
Observation is using your senses to collect information. Empirical data and investigation are related to observation.
Plants take up carbon dioxide from the atmosphere and store it in their organic molecules. This is why forests are known as carbon sinks. Carbon dioxide is a greenhouse gas that causes global temperatures to increase through the greenhouse effect. Its accumulation in the atmosphere is caused by industrial activities of humans. Plants take up this carbon dioxide and mitigate the effects of climate change.