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.

option a is correct i.e.

explanation:

in context to the membrane of nerve impulse, the outer membrane of neuron is semi permeable that is only sodium ions can pass through the membrane i.e. smaller ions can pass through the membrane while larger ions cannot pass through it.

if someone had the list of traits you provided