Help me please Laboratory experiments allow scientists to make precise observations. Which one

of the following is not a laboratory experiment?​

​A counting the population of a country​

​B comparing the color of mold in three different Petri dishes​

​C measuring how much three plants grow with different amounts of light​

​D making observations about the impact of different kinds of fertilizer on

seedlings growing near the windows in the lab​

According to the valence shell electron pair repulsion (vsepr) theory, a molecule that has four electron groups around the central atom will exhibit what electron geometry? view available hint(s) according to the valence shell electron pair repulsion (vsepr) theory, a molecule that has four electron groups around the central atom will exhibit what electron geometry? trigonal bipyramidal tetrahedral square planar determination of electron geometry requires information on whether the electron groups are lone pairs or bonding groups.

Light waves can move through , but they travel fastest when they move through a(n) .

How can a give a full method for the experiment of separating sand from water by filtration? 1-materials 2-steps 3-conclusion also for water and salt separated by the evaporation or distillation process