Answer: Slash-and-burn agriculture is a farming method that involves the cutting and burning of plants in a forest or woodland to create a field called a swidden. The method begins by cutting down the trees and woody plants in an area
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Explanation:
Action potential
It is the potential or power or electrical energy required to generate impulses and provides communication between the neurons is called action potential. Normally cell membrane consists of potential is called resting membrane potential() -70mV. The action potential is due to exchange of different ions across the membrane.
Phases of the action potential in a neuron are
i. Depolarization- it is caused by the influx of sodium and calcium ions through the opening of voltage-gated sodium and calcium channels. sodium ion influx is rapid than the calcium ions membrane potential -70mV to +30mV.
ii. Repolarization - It causes the efflux of potassium ions into the cell through the opening of potassium channels. the membrane returning to resting membrane potential.
iii. After- Hyper polarization - in this stage the potassium channels remain open and causes re polarization and comes to normal membrane potential.
The generation of impulses(depolarization) in neuron mainly depends on influx sodium and calcium ions without these ions, no action potential developed and neuron firing does not occur.
If the drugs inhibit these channels, no depolarization, no action potential, no neuronal firing or communication.
The channels involved in an action potential are voltage-gated sodium channels, potassium channels, and calcium channels.
The action potential is required for transmission of information one are to another area in the body.
The responses to different stimuli is due to action potential.
Explanation:
Trade was also a boon for human interaction, bringing cross-cultural contact to a whole new level. When people first settled down into larger towns in Mesopotamia and Egypt, self-sufficiency – the idea that you had to produce absolutely everything that you wanted or needed – started to fade. A farmer could now trade grain for meat, or milk for a pot, at the local market, which was seldom too far away. Cities started to work the same way, realizing that they could acquire goods they didn't have at hand from other cities far away, where the climate and natural resources produced different things. This longer-distance trade was slow and often dangerous but was lucrative for the middlemen willing to make the journey. The first long-distance trade occurred between Mesopotamia and the Indus Valley in Pakistan around 3000 BC, historians believe. Long-distance trade in these early times was limited almost exclusively to luxury goods like spices, textiles, and precious metals. Cities that were rich in these commodities became financially rich, too, satiating the appetites of other surrounding regions for jewelry, fancy robes, and imported delicacies. It wasn't long after that trade networks crisscrossed the entire Eurasian continent, inextricably linking cultures for the first time in history. By the second millennium BC, former backwater island Cyprus had become a major Mediterranean player by ferrying its vast copper resources to the Near East and Egypt, regions wealthy due to their own natural resources such as papyrus and wool. Phoenicia, famous for its seafaring expertise, hawked its valuable cedarwood and linens dyes all over the Mediterranean. China prospered by trading jade, spices, and later, silk. Britain shared its abundance of tin.
My hands hurt now :')
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The symptoms Jane narrated she is experiencing after the death of her husband shows that Jane is suffering from: major depression.
We naturally and normally feel sad and down occasionally due to life's changes that unpalatable. However, when the feeling of sadness gets prolong that it affects our daily life, it is a sign that clinical depression has set in.
One of the various types of depression is known as Major Depression. It is characterized with the following symptoms:
- Loss of interest in your daily activities.
- Loss of weight.
- Trouble with sleeping.
- Tiredness and mostly without energy.
- Mental and physical sluggishness.
Thus, the symptoms Jane narrated she is experiencing after the death of her husband shows that Jane is suffering from: major depression.
Learn more about major depression on:
brainly.com/question/7581430
