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Shtirlitz [24]
3 years ago
13

What is considered to be the most likely hypothesis for the cause of the extinction of the Pleistocene megafauna?

Biology
2 answers:
Sergeeva-Olga [200]3 years ago
4 0

Answer:

Hunting by the early humans is the appropriate answer.

Explanation:

A set of huge animals, which thrived on Earth at the time of the Pleistocene epoch is known as the Pleistocene megafauna. These species got extinct during the Quaternary event of extinction. There are four theories, which have been considered as the probable causes of the extinction of Pleistocene megafauna. These are change in climatic conditions, hunting by humans, impact from a comet or an asteroid, and spreading disease. However, the majority of the evidence indicates that humans were the prime cause for the extinction to take place.

Natasha2012 [34]3 years ago
4 0

Answer:

C. mammoths

Explanation:

Pleistocene era is the well-known Ice Age. In this period of time, mammoths were the kind of animals existed as saber-toothed cat.

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Which best describes the nucleus of an atom?
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Infectious diseases have an easier time spreading now than they did several hundred years ago. What about society has changed th
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Explanation:

Infectious are more easily spread nowadays becuse of an increased population. The more the population increases, the bigger the advantage an infectious disease has. As of right now, because everyone is wearing masks, their immune systems are being weakened. Another reason for this is because of the increase in chemicals in our foods, which are now being transferred to our bodies. All of the medications people are taking also have an affect on the spread of disease; it gives diseases a chance to mutate.

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3 0
3 years ago
How does the malfunction of ion channels causes cystic fibrosis​
gtnhenbr [62]

Answer:

Ion channel dysfunction

1) altered Cl- secretion in submucous glands,

2) increased Na+ absorption and consequent electrolytes hyperabsorption in the superficial epithelium.  

Explanation:

The normal function of the CFTR protein is to transport Cl- ions as it works a chlorine channel regulated by AMPc and by protein kinase K (PKA). CFTR is also a regulator for other ionic channels.

The CFTR protein expresses in the luminal portion of the secretory and absorptive epithelial membranes. It has a significant role in the secretion of electrolytes activated by AMPc and intracellular calcium. This protein constitutes the way out of Cl- from the lumen. CFTR protein also regulates electrolyte function. It inhibits the epithelial Na+ channel of absorptive epithelial cells from the colon and aerial vias. It also activates the Na+ channel in sudoriparous ducts.

Given that defects in the CFTR protein take to a defective regulation in the Na+ channel, cystic fibrosis characterizes by alterations in electrolytes secretions and absorption.  There are two significant physiopathological mechanisms:

1) altered Cl- secretion in submucous glands,

2) increased Na+ absorption and consequent electrolytes hyperabsorption in the superficial epithelium.  

Patients with cystic fibrosis are incapable of increasing their secretory transport. Three events impede the higher osmotic transepithelial gradient:

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  • high permeability to water.

This leads to hyperabsorption in the patient epitheliums.  The superficial liquid layer in the aerial vias decreases, mucous glands are not released from the mucus, and the mucociliary clearance is strongly altered in aerial vias.

8 0
3 years ago
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