Fromage

A couple years ago my family had a pool in our backyard. It was fairly big, and about 4.5 feet deep. Anyways, we left it untreated for quite some time. The water got dirty, turned green, froze in the winter, and thawed out again in the spring. That's when I noticed all of the things that lived in it. It was actually pretty fascinating, and I have a lot of questions. The first life to appear in the pool was algae, and that doesn't surprise me much. Soon after there were snails, though. Where exactly did they come from? I don't think I've ever seen another snail in the area where I live, so how did they get in my pool? After snails came some sort of spider that glided on top of the water, and little black wormy things that would swim around. And like the snails, I've never seen these things anywhere else in my area, so how did they get there? My mother said that a bunch of stuff probably fell from the tree above the pool into the water, but I'm not too sure about that... Anyways, sorry if these are dumb questions, but I've been thinking a lot about it lately.

Do I have to memorize the eight steps of the Krebs Cycle to pass the AP Exam? Will there be questions that require me to know all the chemical changes of each step?

For 10 electrons: 1s2, 2s2, 2p6 (px2, py2, pz2)?

I just learned about the Aufbau chart, and I used it to determine the orbitals of atoms with 8 and 10 electrons. Atom with 8 Electrons: 1s2, 2s2, 2px1, 2py1, 2pz1, 3s1 Atom with 10 Electrons: 1s2, 2s2, 2px1, 2py1, 2pz1, 3s2, 3px1 Are these right??

How common is ionic bonding between atoms that need to gain or lose 3 or more electrons for a full valence shell?

Hmm... very interesting... I think the deer would first be afraid, but upon realizing that it didn't move or otherwise pose a threat, would be fine with it. They might ever get used to the noise, though; I don't know how sensitive their ears are. Somebody should try this, I'd like to know what would happen.

Moving a copper wire (or other conductor) through a magnetic field causes electric current to flow in the wire (as in generators). On an atomic level, what is it about the magnetic field that generates the electric current in the wire?