It's the 2nd and 4th one.
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Answer:
Effect of this occurrence is : Scientists have discovered hundreds of exoplanets in the Milky Way Galaxy.
C) The deacidification process preserves pages by neutralizing acid with magnesium oxide, raising the pH level of the paper, and minimizing the alkaline reserve.
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Answer:
I believe this would be an adverb phrase as you are describing an action.
Answer: Hewo, there! your Answer Is below
1. the action or process of observing something or someone carefully or in order to gain information.
2. two types of observations, qualitative and quantitative. Qualitative observations are made when you use your senses to observe the results. (Sight, smell, touch, taste and hear.) Quantitative observations are made with instruments such as rulers, balances, graduated cylinders, beakers, and thermometers. These results are measurable.
Observation is essential in science. Scientists use observation to collect and record data, which enables them to construct and then test hypotheses and theories. Scientists observe in many ways – with their own senses or with tools such as microscopes, scanners or transmitters to extend their vision or hearing.
Explanation:
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