Answer:
Cell
Explanation:
A cell is the smallest unit of a living thing.
Answer:
Louis Pasteur.
Explanation:
Louis Pasteur gave theory of spontaneous generation that states, life arose from non-living things. Pasteur disprove the theory of spontaneous generation by S-shaped tube experiment.
He used swan-neck shaped flasks (twisted necks) and filled the flasks with sterilized beef broth. Due to twisted neck, entry of air was allowed to the flasks from outside, but not microorganisms.
In these sterilized flasks, microorganisms could not grow as entry of airborne microbes was prevented. But if the necks of flasks were broken, growth of microorganisms entered into flasks and showed growth.
Thus, Louis Pasteur showed that microorganisms do not grow spontaneously in flasks with beef broth.
Answer: C. 2 ft
Explanation:
if the scale is 1:2,000
This means that if the original plane flyes 2,000ft above the ground, the model plane will fly 1ft above the ground.
Now, if the plane flies 4,000ft above the ground, this is two times as the number from above, then the model plane will also fly two times as the number from above.
2*1ft = 2ft.
Now, we also can do it as:
2000ft equiv to 1 ft.
4000ft equiv to x
x = 1ft*(4000ft/2000ft) = 1ft*2 = 2ft.
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:
Habitat alteration-every human activity can alter the habitat of the organisms around us. Farming, grazing, agriculture, clearing of forests, etc. This is the greatest cause of biodiversity loss today.
Explanation:
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