Based on the periodic table shown above, elements in which of the following groups have the greatest density?
a.
group 18
b.
group 17
c.
group 15
d.
group 12

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error

(b) which contains higher levels of vitamin b, oranges or spinach?

explanation:

you can eliminate a, c, and d because they are questions based on opinions.