Help Me To Solve These Question In general biology

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A-Discuss these question in useful as scientific hypotheses and give if it could be falsified and what factors are measurable and controllable:

1. Sea turtles are likely to hatch at the period of the new moon.
2-. Drinking coffee a day decreases the risk of heart disease in women.
3. Manatees and elephants have a same ancestor.
4. Organic food is healthier than the other types of food.

B-Questions:Answer them in scientific way:
1- How effective are extracts of marigold and rosemary as mosquitoes repellents?