100pts: Why was obsidian used to make scalpels?

2 answers:

8 0

Answer: Obsidian has been used as a cutting tool since the Stone Age, but modern versions of obsidian scalpels are manufactured by a Virginia archaeologist using a pressure flaking process. Each knife can be used from 10 to 20 times before being discarded, Green says. He keeps his blades in a cold sterilizing solution to preserve their sharpness.

Step-by-step explanation:

Margaret [11]3 years ago

3 0

Answer:

Research also confirms that incisions carried out with obsidian produce narrower scars and fewer inflammatory cells. This is because on cellular level, obsidian knife cuts between cells rather than tearing it in case of a steel knife, hence, a sharper cut allows the wound to heal more easily with negligible scarring.

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(2.5 x 10^9) + (5.3 x 10^8) = (2.5 + 5.3) x (10^9 x 10^8

makvit [3.9K]

Answer:

Read below.

Step-by-step explanation:

Wrong:

(2.5 x 10^9) + (5.3 x 10^8) =

(2.5 + 5.3) x (10^9 x 10^8) =

7.8 x 10^7=

7.8 x 10,000,000=

780,000,000

<u>Bold is edited by me</u>

Correct:

(2.5 x 10^9) + (5.3 x 10^8)=

(2.5 x 1,000,000,000)+(5.3 x 100,000,000)=

2,500,000,000+5,300,000,000=

7,800,000,000

The problem is that whoever wrote it swapped the numbers in the parentheses, added a pair of them together and multiplied the other pair. You are not supposed to take out the pairs and swap them if you'd like or the answer is incorrect. Second mistake is that $10^{9} * 10^{8}$ is not $10^{7}$ I do not know how and where you got that answer from.