Discuss the Cambrian explosion
What will be an ideal response?
Life has existed on Earth for at least 3.4 billion years, but there is no evidence of anything more than simple organisms until about 540 million years ago, when life suddenly branched into a wide variety of complex forms. This sudden increase in complexity is known as the Cambrian explosion, and it marks the beginning of the Cambrian period.If you represented the entire history of Earth on a scale diagram, the Cambrian explosion would be near the top of the column. The emergence of most animals familiar to you today, including fishes, amphibians, reptiles, birds, and mammals, would be crammed into the topmost part of the chart, above the Cambrian explosion.
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Nearly all life on Earth passes on its heredity using
A) lipids B) RNA C) DNA D) proteins
An object is undergoing simple harmonic motion of amplitude 2.3 m. If the maximum velocity of the object is 10 m/s, what is the object's angular frequency?
A) 4.3 rad/s B) 4.8 rad/s C) 3.5 rad/s D) 4.0 rad/s
In an RLC circuit, the resistance is 10. ohms, the capacitive reactance is 30. ohms, and the inductive reactance is 50. ohms. What is the circuit impedance?
A) 10. ? B) 22. ? C) 90. ? D) 63. ? E) 81. ?
Conversion of Units: In a country where the unit of currency is the Passi, kerosene costs 130 Passi per liter, and one dollar buys 227 Passi. What is the cost of kerosene in dollars per gallon? (1.00 gal = 3.79 L)
Fill in the blank(s) with the appropriate word(s).