10 pointsA seventh-grade student has designed an experiment to study phototropism in radish seedlings. Six radish seedlings will be planted
in Individual foam cups filled with soll. Three cups will be covered with
Box A and three cups will be covered with Box B as shown in the
diagram.
The only light source for each set of seedlings will be an overhead
fluorescent light that enters through the openings cut into the sides of
each box. The plants will receive 8 hours of light per day and will
remain inside the boxes for four days. At the end of the testing period,
the boxes will be removed and the direction of seedling growth will be
compared
opening
in box
opening
in bok
Box A
Box B
Which of the following modifications of the experimental design would
significantly increase the validity of the results? (7.13A/7.2A)
A.
using light bulbs designed for growing indoor plants
B.
doubling the number of seedlings grown in the experiment
C. including a set of three plants grown without a box
D.
planting all the seedlings for each box in one large container

it's filtration, but this is an assumption so my apologies if i got this

solute : a solute is a substance that is dissolved in another substance is known as a solvent. it is mixed with a special mixture know as homogeneous mixture.

solvent: a solvent is a substance that dissolved a solute, which results in a solution is known as solvent.

po-215 i got it right on the quiz

most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).