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maksim [4K]
3 years ago
9

How many elements have been found to occur in nature? 90 092 96 99

Biology
2 answers:
irakobra [83]3 years ago
7 0

Answer:

Of the 118 elements that have been discovered, there are 90 elements that occur in nature in appreciable amounts.

Explanation:

Depending who you ask, there are another 4 or 8 elements that occur in nature as a result of radioactive decay of heavier elements. So, the grand total of natural elements is 94 or 98. As new decay schemes are discovered, it's likely the number of natural elements will grow. However, these elements will likely be present in trace amounts.

There are 80 elements that have at least one stable isotope. The other 38 elements exist only as radioactive isotopes. Several of the radioisotopes instantly decay into a different element.

It used to be believed that of the first 92 elements on the periodic table (1 is hydrogen and 92 is uranium) that 90 elements occur naturally. Technetium (atomic number 43) and promethium (atomic number 61) were synthesized by man before they were identified in nature.

wel3 years ago
5 0

Answer:

92

Explanation:

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the stomach is located inferior to the diaphragm and lateral to the liver on the left side of the abdominal cavity. The stomach forms part of the gastrointestinal tract between the esophagus and the duodenum

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Stem cell and cancer question. Please answer Asap!!
malfutka [58]

Metastasis will happen and cancer cells invade nearby healthy cells, tissues, lymph nodes, organs or will migrate to distant organs.

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Cancer cells migrate to other parts of the body via blood and lymphatic system. This is called as metastasis. Cancer cells when becomes tumour they develop their own blood vessels and obtain nutrients from them. Once the tumour gets big it pushes the normal healthy cells of the neighbouring tissues and keeps on spreading.

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4 0
3 years ago
Which of the following is true when an individual exhibits two identical recessive alleles?
neonofarm [45]

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3 years ago
List five factors or behaviors that affect cholesterol levels in the body, how these factors affect cholesterol levels, and whet
anyanavicka [17]
Hey there,
Q1 & Q2) 
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2) Diet- Cholesterol depends on the food you eat. If you eat food with too much saturated fat, you get a high level of cholesterol. 
3) Weight- If you are obese, you are more prone to get cholesterol. Thus, you need to lose weight
4) Exercise- Exercise regularly to maintain a perfect cholesterol level
5) Stress- If you are a student, take breaks in between study timings to keep you less stress or if you are an adult, go for walks and do something that you like the most to calm your brain down.

Q3) Cholesterol causes plague to grow in your hearts. This thick, hard plague will block the arteries and will cause heart attacks and strokes. 

Q4) Pros- <span>Helps maintain healthy cholesterol levels, lowers risks of heart attacks and strokes
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Hope this helps :))

~Top
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3 years ago
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