In an experiment designed to show how life may have begun on Earth, scientists demonstrated that an electrical spark—...

Shiyi on June 2, 2019

Why is B incorrect?

B only says do not form readily, so amino acids can still be formed. So why is B incorrect?

2 Replies

Ravi on June 2, 2019


Happy to help. Let's take a look at (A) and (B).

(A) says, "Meteorite impacts at the time life began on Earth
temporarily created a reducing atmosphere around the impact site."

(A) can help explain how lightning could have produced the first amino
acids on Earth. It's possible that the atmosphere was not right for
amino acids to form, but meteorite impacts could have temporarily
produced the necessary conditions. (A) provides an explanation for how
amino acids could have formed, so it's the correct answer choice.

(B) says, "A single amino acid could have been sufficient to begin the
formation of life on Earth."

(B) does not help to explain how amino acids could form is the
atmospheric conditions weren't right for their formation. It doesn't
matter if it just takes one because if the atmosphere isn't right,
they won't form. Thus, (B) is out.

Hope this helps. Let us know if you have any other questions!

Daniel on March 21 at 08:21PM

Can you please elaborate on this? The passage doesn't say that amino acids won't or can't form in this atmosphere, it just says that it is unlikely for them to form and they are more likely to break apart. But B seems just as likely to create possibility for life to form in this atmosphere as A...what are the chances lightning strikes in exactly the place where a meteor strikes?