Question

Organic molecules are sometimes found within meteorites that crash into Earth. Which conditions on meteorites in space are similar to those that likely prevailed on Earth early in its history?

A. no oxygen
B. very cold temperatures
C. absence of liquid water
D. high levels of carbon dioxide
E. presence of inorganic molecules
F. high levels of ultraviolet radiation

Answer 1

B, D, and F ?

C, D, and E ?

A, E, and F ?

A, B, and C ?

Answer 2

Can it be more than one?

Answer 3

Mmhm. There is a list of the options to choose from above.

Answer 4

It can be A B and C. It can be A E and F. C D and E. and B D and F.

Answer 5

For the moment, not looking at the list of possible combinations but at the list of statements itself, do any strike you as being true or false off the bat?

Answer 6

C D E

Answer 7

False, I believe because of A. I believe A will be in the list of the right answer.

Answer 8

A will be on the right answer list. Do any other statements strike you as being on the right answer list? Or on the wrong answer list?

Answer 9

F won't be on the list.

Answer 10

UV rays don't seem to come to mind when I think about "early life".

Answer 11

I think F will be on the list. It is talking about conditions on earth pre-life. There is a heck of a lot of UV radiation in space. In fact, that is what the current earth's atmosphere bounces back into space. Meteorites in space are plainly exposed to it and the pre-life Earth with it's forming atmosphere was almost certainly exposed to it too.

Answer 12

All sorts of radiation in space, actually. Not just UV.

Answer 13

I didn't know that. So, A and F WILL be on the list? Hmm..

Answer 14

I guess presence of inorganic molecules will be, as well.

Answer 15

I agree. Inorganic molecules are anything molecules that aren't organic. In other words, rocks. Meteorites are made of rocks, the earth is still made of rock. Pretty plain.

Answer 16

Im dumb.

Answer 17

Mind going over another? I'll re-post.

Answer 18

Definitely. Let's just finish up with this one first.

The question wants to emphasize that most scientists think life formed initially from inorganic molecules. The process of forming needed energy from somewhere and that energy was probably from UV radiation.

Some scientists have verified this by treating inorganic molecules with high levels of UV radiation and have formed organic molecules out of them. Whether or not that is how life *actually* formed on earth has not yet been decided.

Answer 19

I don't have a clue how life was actually formed on earth, but if I was to make a guess at it, I'd say we have always been here. We didn't form from GOD. I go deep, but you know what I'm saying, right?

Answer 20

Science isn't nothing, but facts, is it? It's just educated guesses and experiments and tests. Most of it might be factual based, but Science in general is a form of an opinion, isn't it?

Answer 21

I do. No one in science has a plausible idea about how life formed, though a lot of good thought has gone into speculating about it.

And you are absolutely right about science. It is a set of concepts which seem to explain data (observations) well. And these concepts usually make reasonably good predictions about what observations we will see in new experiments. Sometimes they do not - and then we go back and change them.

Answer 22

Hmmm... I see. :)

Answer 23

what the answer?

Answer 24

what the answer?