Answer:
Starting molecules not completely and quickly convert to its possible product because an activation energy barrier exist that must be overcome for conversion to product.
Explanation:
The activation energy of a chemical reaction is closely related to its rate. This is because molecules can only complete the reaction once they have reached the top of the activation energy barrier. The higher the barrier is, the fewer molecules that will have enough energy to make it over at any given moment.
Many reactions have such high activation energies that they basically don't proceed at all without an input of energy. For instance, the combustion of a fuel like propane releases energy, but the rate of reaction is effectively zero at room temperature. Once a spark has provided enough energy to get some molecules over the activation energy barrier, those molecules complete the reaction, releasing energy. The released energy helps other fuel molecules get over the energy barrier as well, leading to a chain reaction.
The correct answer would be The Heart
The answer is TRUE~! =^-^=
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Cecildoesscience </span>
Answer:
Major issue
Air pollution. The death rate from both indoor and outdoor air pollutants was 133.3 per 100,000 populations(2017) which is the second-highest death rate after due to Cardiovascular diseases in Nepal. ...
Unsafe water. ...
Unsafe hygiene. ...
Water and air pollution. ...
Deforestation. ...
Overpopulation.
Answer;
-Cochlea; rods and cones; retina
Making an analogy between hearing and vision, the auditory hair cells in the cochlea are similar to the rods and cones in the retina.
Explanation;
-There are two types of photoreceptors in the human retina, rods and cones. Rods are responsible for vision at low light levels (scotopic vision). They do not mediate color vision, and have a low spatial acuity.
-Cones are active at higher light levels (photopic vision), are capable of color vision and are responsible for high spatial acuity. The central fovea is populated exclusively by cones.
The cochlea is a portion of the inner ear that looks like a snail shell. It receives sound in the form of vibrations, which cause the stereocilia to move. The stereocilia then convert these vibrations into nerve impulses which are taken up to the brain to be interpreted.
