In a laboratory experiment, students use the setup shown in the image. They attach a string to the car and run it over a pulley, and at the other end of the string, there is a small hanger with a
weight. This weight is never changed in the
experiment. The students conduct 3 trials by
releasing the car and letting the force from
the weight pull the car across the table as
they measure velocity and acceleration. For
the second trial, weights are added to the
car before the experiment is run. For the
third trial, even more weight is added to the
car before the experiment is run. Using
Newton's Second Law, compare and contrast
force, mass, and acceleration of the toy car
for each of the three trials.

In meteorology, a  cloud  is an aerosol consisting of a visible mass of minute liquid droplets, frozen crystals, or other particles suspended in the atmosphere of a planetary body. nephology is the science of  clouds, which is undertaken in the  cloud  physics branch of meteorology.cirrus clouds  usually describe clouds high in the atmosphere that can include wispy clouds, typically with ice crystals. variations include cirrus, cirrocumulus and cirrostratus as defined by the cloud's position in the atmosphere.layered stratus clouds  have both flat tops and bases, and can appear as if they take up the whole sky, stretching from horizon to horizon. other combinations and variations include stratus, stratocumulus, nimbostratus and altostratus.cumulus clouds  often pile up in multiple layers of the atmosphere, representing clouds that develop vertically. cumulus clouds often look like pillars with anvil-type tops or columns of clouds stacked vertically. variations include cumulus, cumulus-congestus, cumulonimbus and altocumulus.

Ch4 is nonpolar and insoluble in water. since all of the hydrogen atoms are evenly spread around the carbon atom even through the c h bond is polar all the poles cancel each other out.

C: plants and animals