Some fuel cells are powered by hydrogen. scientists are looking into the decomposition of water (h2o) to make hydrogen fuel with the of the sun’s energy. what challenge do scientists face with this task?
a. decomposing water requires a high activation energy.
b. the sun isn't a renewable resource.
c. decomposing water results in toxic byproducts.
d. scientists are uncertain what to do with the excess oxygen.

A. Decomposing water requires a high activation energy.

Explanation:

The decomposition of water requires a lot of electrical energy or heat input, generated from some primary energy source (fossil fuel, for exemple). This amount of energy has a strong impact on nature and is an expensive process that would increase the economic value of hydrogen f**ls. For this reason, we can conclude that the challenge facing scientists for hydrogen f**l production is that the decomposition of water requires a high activation energy.

brown

explanation:

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.