Which statement about the ellipsis is true? . i. an ellipsis indicates the omission of a word or words.. ii. it is appropriate for an ellipsis to appear in any part of a sentence.. iii. a single space between the periods is necessary when using an ellipsis..
the correct option is b.explanation
evolution is a biological phenomena which descries how the heritable characteristics of a species change over successive generations. these characteristics change as a result of a mutation, natural selection or genetic recombination (to list a few).
darwin's theory of evolution explained how this phenomena occurs with respect to natural selection. the theory goes on to explain how a species diverges from a common ancestor into two or more different species (meaning different species may have common ancestor). this is a slow process as it can take thousands of years.
hope this !
just watched a program with stephen hawking about time-travel and it turns out that the further you get away from gravitation, the faster time goes. in his experiment there were 20 nanoseconds in difference on 2 atomic clocks after 24 hours with 1 clock on top of a 3800 meter high mountain and 1 on the ground. so if you spend a lot of your time in a plane, you might live shorter because time is faster up there. pretty interesting, huh?
energy transformation does happen when you drop a pencil.
the energy turns from potential energy in your hand to kinetic energy as it drops and back to potential energy when it hits the ground.
answer: b.) 25% unchanged and 75% stable
now, to calculate the initial amount of radioactive isotope
a = amount of reactant left after n-half lives = 60 g
= initial amount of the reactant = ?
n = number of half lives= 2
putting values in above equation, we get:
thus percentage of sample unchanged=
the percentage of sample decayed or has become stable=