According to scientific data, when did life on earth begin? Please support your response
What will be an ideal response?
The oldest direct traces of life on earth date back 3.4 to 3.5 billion years. In rocks of that age in Australia
and Southern Africa, geologists have found stromatolites, layered structures created through the activity
of primitive algae and bacteria. Other Australian rocks of similar age provide even more direct evidence
of ancient life. Sections of these rocks, known as cherts, show fossilized remains of blue-green algae.
Rocks also reveal even more distant, indirect traces of life. Living things use particular isotopes (atomic
forms) of the element carbon preferentially. The mix of carbon isotopes detected in rocks from Greenland
more than 3.8 billion years ago shows evidence of life on earth.
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What type of A/C system is shown in this diagram? A)
A) Vapor system
B) VAT system
C) TXV system
D) Orifice tube system
El componente etiquetado con el número 4 en la Figura 1 es un:
a. juego de sello de extremo. b. juego de empalme. c. juego de conexión de energía. d. juego T.
The law of synergy suggests that two people can achieve more working together than they
can achieve working individually.
Indicate whether the statement is true or false.The ____ thread is used where power is to be transmitted in one direction.
A. Buttress B. Square C. Acme D. Load