Which elements are most abundant in living organisms?
A) oxygen, nitrogen, carbon, hydrogen, sulfur, and phosphorus
B) carbon, potassium, iron, magnesium, hydrogen, and nitrogen
C) hydrogen, carbon, calcium, potassium, oxygen, and phosphorus
D) oxygen, calcium, phosphorus, sodium, hydrogen, and carbon
A) oxygen, nitrogen, carbon, hydrogen, sulfur, and phosphorus
B) carbon, potassium, iron, magnesium, hydrogen, and nitrogen
C) hydrogen, carbon, calcium, potassium, oxygen, and phosphorus
D) oxygen, calcium, phosphorus, sodium, hydrogen, and carbon
Answer & ExplanationAnswer: A) oxygen, nitrogen, carbon, hydrogen, sulfur, and phosphorus
Explanation:
Living organisms often contain trace amounts of several elements, but the most abundant ones are oxygen, carbon, hydrogen, nitrogen, calcium, sulphur and phosphorus.
The amount of water vapor in the air is called Humidity. The amount of water vapor that air acn hold depends on the temperature of the air. The amount of water vapor in the air as compared with the amount of water that the air could hold is called Relative humidity.
A boy is swinging a ball attached to a string in a horizotal circle. If the string snaps
A) the ball will travel towards the center of the circle and fall down
B) it will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down
C) it will fall down at the same place where the string breaks
D) None of these
A) the ball will travel towards the center of the circle and fall down
B) it will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down
C) it will fall down at the same place where the string breaks
D) None of these
Answer & ExplanationAnswer: B) it will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down
Explanation:
The centripetal force having been removed the body cannot execute the curved path
On 1 september 1939 German armies marched into poland. On 3 September Britain and France declared war on Germany.Thus the invasion of poland marked the beginning of the Second World War. The German armies completed the conquest of poland in less than three weeks as no aid reached poland. In spite of the declaration of war, however, there was little actual fighting for many months. Therefore, the war during the period from september 1939 to April 1940 when germany invaded Narway and Denmark is known as the "Phoney War"
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