Question

Formation of the sun in steps from nebula to nuclear fusion ?

Answer 1

@Zarkon

Answer 2

http://www.space.com/19321-sun-formation.html
This might help! :)

Answer 3

thank you ! :D

Answer 4

No problem! Let me know if it doesn't make sense or you still have questions, and I can try to help you out! :)

Answer 5

Can you help me with one more thing ? :)

Answer 6

sure!

Answer 7

How does solar activity affect earths temperature ? :)

Answer 8

Well, times of reduced solar activity seem to historically correspond with global cold spells. Similarly, times of increased solar activity have corresponded with global warming trends.
That sort of makes sense, right? I mean, it's kind of intuitive that when the sun is more active, it's warmer, and when the sun is less active, it's cooler.

Answer 9

oh okaay yeah i got it. thanks :) one more pleasee.... sorry for the bother

Answer 10

No problem! It is the purpose of the site, after all ... ;)

Answer 11

how can bone structures of similar organisms prove common ancestry ?

Answer 12

Ooh, this one's fun. Have you learned about natural selection yet?

Answer 13

yea ,its when an animal adapts to an environment right ?

Answer 14

Basically, yes! So because of that, we have lots of different species instead of just a couple, because each specie can split off into several other species as a result of those adaptations.
Make sense so far?

Answer 15

no ...

Answer 16

OK.
Let's say we have a group of birds. They're all the same specie.
Then one day, there's a mud slide or something, and some of the birds are separated from the others.
So now we have 2 groups of the same specie of birds, but they can't get to each other.
With me so far?

Answer 17

yea

Answer 18

All right, so a couple years go by, and over time the birds in each group start to evolve. They adapt to their environment, like you said earlier. Except after a while, the two groups of birds adapt SO differently that they become 2 different species.
Does that make sense?

Answer 19

ohh ok so it would be cuz of natural selection ?

Answer 20

Yes. That's how new species are created.
But remember! Those two species of birds are still pretty similar, because way back when they used to be one specie.
So if you were a scientist, how do you think you would try to tell if those two species had come from a "common ancestor" (in other words, if they had once been 1 specie) ?

Answer 21

by natural selection ! :)

Answer 22

That's true, but how could you tell if natural selection had happened? Maybe the birds are unrelated, for all you know. (Hint: think back to the question!)

Answer 23

bone structures ?

Answer 24

Yes! Do you know why the bone structures could help you?

Answer 25

(You're doing a great job, we're SUPER close to the answer.)

Answer 26

thats how you know their related.

Answer 27

Right, because the bone structures of the two birds will be similar, even though they're from two different species. So you can use that to say that those two species once were 1 specie.

Answer 28

Great job working through it! Now you know how similar bone structures help to prove "common ancestry"

Answer 29

ok. i do but help me put all of this into a small statement please:)

so it would be Natural selections help prove that they come from similar ancestry by their bone structure..

Answer 30

Almost. Try filling in this blank for a nice statement: "Bone structure helps prove the common ancestry of two species because ..."

Answer 31

of natural selection ?

Answer 32

Try to be a little more detailed. It's not JUST because of natural selection, it's because similar bone structure means that the two species were once one specie.
They became two species because of natural selection, but it's more important to talk about the two species that once were one.
Does that make sense?

Answer 33

yes but how do i write that ?

Answer 34

Well, go back to the fill-in-the-blank i gave you. How do you think you could fill in that blank to talk about the one specie splitting into 2?

Answer 35

of natural selection; because if an organism has similar bone structure to another.... i dont know how to say it,or explain it...

Answer 36

... then that means that they were once 1 specie, but broke off into 2 species over time through evolution.
Is that what you're trying to say?

Answer 37

yes ! i just suck at putting these things into words.
Thanks :)

Answer 38

No problem! I totally understand, sometimes it can be really hard to figure out how to say it. Do you understand the concept though? (It's fine if you don't, I can try to explain it better)

Answer 39

no really i got it. :)

Answer 40

OK cool just checking ;)

Answer 41

Well congrats! You did a really good job working through it !

Answer 42

thanks ! and you did a good job explaining :)

Answer 43

thanks :D

Answer 44

@stormgirl47

Hey im sorry how about 2 more questions about evolution .. ? :)

Answer 45

sure but please close this one and make them separate questions so i can get new medals for them :)