Climate change, habitat destruction, extinctions — thousands of years ago. And humans may have been partly to blame for many of those changes in nature, too. with a changing climate, led to the extinction of many species of megafauna about 12,000 years ago in the southern portion of what is now South America.

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2 years ago

Gel electrophoresis is used to __________ dna fragments

Serga [27]

The answer is A. seperate

3 0

2 years ago

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Which of the following is the correct description of a myocardial infarction and what it is caused by? View Available Hint(s) Wh

Luda [366]

<h2>The answer that is correct is the: Third statement.</h2>

Explanation:

Heart is one of the most essential organ in the human body as it is responsible for supplying nutrients and oxygen to all the parts of the body and collecting waste materials and carbon dioxide from all the parts of the body through the blood.
The cells (fibroblasts, cardiomyocytes, etc.) of the heart itself are provided with the nutrients and oxygen by a specialized blood vessel called the Coronary Artery.
Waste materials and carbon dioxide are removed from the cells of the heart by another specialized blood vessel called the Coronary Vein.
Due to aging or consumption of excess fat and cholesterol rich food, the concentration of lipid molecules in blood get increased beyond normal.
These lipid molecules get deposited in the walls of the arteries, including the coronary artery, forming plaques, resulting in the development of atherosclerosis.
This reduces the diameter of the arteries, including the coronary artery, thereby reducing the blood flow through them.
Due to plaque deposition, the coronary artery is incapable for carrying sufficient oxygen and nutrients to the heart cells, causing their death.
This results in the development of a sharp pain in the chest that is diagnosed as Heart Attack or Myocardial Infarction.

7 0

2 years ago