Brownian motion is due to:

A. The random fluctuation of the energy content of the environment.
B. The random movement of pollen granules suspended in water.
C. Thermal noise.
D. The random fluctuation of the energy content of the environment and thermal noise.

B. The random movement of pollen granules suspended in water.

Explanation:

Brownian motion or pedesis is defined as the random motion of particles suspended in a fluid resulting from their collision with the fast-moving molecules in that fluid.

Because the movements of atoms and molecules in a liquid and gas is random, larger particles will disperse evenly throughout the medium. If there are two adjacent regions of matter and region A contains twice as many particles as region B, the probability that a particle will leave region A to enter region B is twice as high as the probability a particle will leave region B to enter A.

prophase: we can observe the chromosomes to coil up and condense. they become visible. nuclear membrane and envelope disintigrate.s

metaphase: chromosomes align at the center, the metaphase plate. spindle fibers attach to centromeres of the sister chromatids. they meet at kinetochores.

anaphase: sister chromatids are pulled towards each opposing centromere, set on different poles.

telophase: chromosomes are now clustered up only on either sides of the cell. nuclear membranes reform, and a new cell wall forms along the cell plate. this will lead to cytokinesis, the process that divides the cell membrane and forms the cell wall.

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)