Answer:
Wood suitable for carpentary and building is known as timber. It is of two types, hardwood (most dicots) and soft wood (gymnosperms and some dicots like Salix; Salmalia and Morus). Heaviest wood is that of Guaiacum officinale but in India, Acacia sundra.
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Answer: observational study
Explanation:
The observational studies are those studies where the researchers observes the samples or individuals of research without any intervention or manipulation.
In epidemiology, and nutritional studies the researcher observes the risk factors associated with the disease, diagnosis and treatment. The effect of a diet on the patient or volunteers can be done through observational studies.
Walking briskly (3 miles per hour or faster, but not race-walking)
Water aerobics.
Bicycling slower than 10 miles per hour.
Tennis (doubles)
Ballroom dancing.
General gardening.
