The two main factors:
1. Precipitation
2. Temperature
In recent molecular genetic studies, genes associated with the neurotransmitter Dopamine have been linked to ADHD.
ADHD stands for Attention Deficit Hyperactivity Disorder. People with ADHD have a hard time focusing on tasks. Scientists have found that the low levels of dopamine in the brain are associated with the symptoms of ADHD. It is because the neurons in the brain have a high amount of protein called the dopamine transporters. These proteins block the dopamine from passing between the neurons. This decreases the effect of dopamine.
Answer:
Carbon dioxide, nitrous oxide, and methane
Explanation:
Hey you! Here's your answer:
1) Scientists discovered ways to derive embryonic stem cells in 1981, more than 30 years ago.
2) Canadian Scientists Dr. James Till and Ernest McCulloch, who did pioneering studies in stem cell research, were the first to discover stem cells.
3) Thousands of experiments and studies have already been conducted on stem cells and research.
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