Since you provide no options, here are the usual parts of scientific method :
- Idea / question which answer you want to find out
- Research , collecting all kinds of data
- Hypothesis , an explanation that is made at the starting point, before the experiment
- Experiment , to find out whether your hypothesis is right
- Analyze the data that you got from the experiment
- Conclusion, your final judgement based on the result of your experiment
Answer: the botanist Matthias Schleiden and the zoologist Theodore Schwann stated
Explanation: This Cell Theory has been influential in shaping the biological sciences ever since, in 1838/1839, the botanist Matthias Schleiden and the zoologist Theodore Schwann stated the principle that cells represent the elements from which all plant and animal tissues are constructed.
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The freezing point of water is zero degrees Celsius.
Nitrogen, I found my answer here
http://slideplayer.com/slide/8953264/
The answer for the question is; during the first trimester. This is because taking recommended dosage of folate starting at least one month before conception and during the first trimester of pregnancy reduce the baby's risk of neural tube defects by up to 70%.
