When did stromatolites appear on Earth? A) Proterozoic
B) Archean
C) Hadean
D) Mesozoic

Massive formations of stromatolites showed up along shorelines all over the world about 3.5 billion years ago. They were the earliest visible manifestation of life on Earth and dominated the scene for more than two billion years.

Proterozoic:2.5 billion years ago

Archean:4billion years ago

Hadean:4.0 billion years ago

Mesozoic:252.2 million years ago

Step-by-step explanation:

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ruth is 6 years old

step-by-step explanation:

6 + 24 = 30,   so 6/30 = .2  

if you do 1/5 it also equals .2, so that is the answer.

the rocket cannot penetrate the ground, in a contextual sense, therefore the roots of this equation should be the domain of this function. i'll let you find the roots of this quadratic equation (hint: use the quadratic formula:  

1- c

2-a

step-by-step explanation:

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