Stimulants are substances that all result in the increase of levels of dopamine in the brain, which is a neurotransmitter that affects attention and pleasure. What this means is that stimulants affect our brain and the way it works by changing the ways that nerve cells communicate.
Neurons (nerve cells) are the cells that have a role in transmitting messages from the brain to other parts of our body, and vice-versa, which is important for pain response, alertness, energy etc.
With long-term use, the use of stimulants would affect the central nervous system (speeding it up), the brain, and the functions necessary to live, like respiration, heart rate, blood pressure, body temperature. Levels of neurotransmitters like dopamine, serotonin, and GABA, which are responsible for the regulation of different processes, are also impacted, which creates a chemical disbalance ultimately resulting in behavioral changes, mood swings, altered attention, movement and energy, stress etc.
So the part of the body that is affected the most with the long-term use of stimulants like cocaine, nicotine, methamphetamine is the brain of course, which is where these substances have the most impact, but the impact on the central nervous system, autonomous nervous system, and neurotransmitter levels is significant.
Answer: The correct answer is -
D) giraffes having increasingly longer necks over time.
Natural selection is an evolutionary mechanism that was proposed by Darwin.
According to this mechanism, organisms that are better capable of adapting to their changing environmental conditions, survive and increase their number through reproduction whereas other are eliminated from the population.
Example - Long neck of Giraffe, which is much elongated, lofty stature, that was beautifully adapted for browsing on the higher tree branches. This was an adaptation with slow and gradual change in the gene frequency as the lower vegetation was eaten by other animals. Due to this, giraffes had to search for other source (that was higher tree branches).
This is considered as a peculiar example of natural selection.
Pglo is a plasmid.it has a gene for a protein that is bioluminescent.positive pglo bacteria have this plasmid while negative pglo bacteria do not
The staff unit should conduct Debriefing.
Debriefings are usually in small unit and crew activities, and this is in context
of a training shown to improve Knowledge, Skills, and Abilities (KSAs)
significantly when conducted formally using pre-defined measures of performance
derived from front-end analysis. Debriefings are very effective when conducted
actively between the person of the immersive activity and the assessment or observation
personnel.
Fermentation: When no oxygen<span> is used to break down food and release energy. Only plants have this organelle: chloroplast (hint: it is where </span>photosynthesis<span> takes place); Before . What do the small numbers in the </span>equation<span> represent? a) </span>Atoms<span> b) </span>Molecules<span> c) Base. </span>How many Molecules<span> of Carbon Dioxide are inputs?</span>
