<p>@boramk</p>
<p>this is an ap environmental science topic… check this page out:</p>
<p>[Biochemical</a> oxygen demand - Wikipedia, the free encyclopedia](<a href=“http://en.wikipedia.org/wiki/Biochemical_oxygen_demand]Biochemical”>Biochemical oxygen demand - Wikipedia)</p>
<p>is clearly refers to a depletion in dissolved oxygen in water as a result of pollution.</p>
<p>what you’re thinking of is called eutrophication, which is a result of too many nutrients, not lack of oxygen.</p>
<p>phosphates in the lake or lakes</p>
<p>How does phosphorus get into the Lake?
Phosphorus comes from what is called point and non point source pollution. Wastewater treatment or industrial discharges are examples of point source pollution. In point source pollution the source of the problem is localized and easily identifiable. This type of pollution produces about 20% of the excess phosphorus in the Lake. Non point source pollution contributes the rest of the Lake’s excess phosphorus. Non point source pollution is more dispersed, coming from runoff from roads, farm fields, septic system effluent, and residential lawns that have been fertilized with a high phosphorus fertilizer. Because it is widely dispersed, this type of phosphorus pollution is more difficult to control.</p>
<p>source: [Phosphorus</a> on Lake Champlain](<a href=“http://www.lclt.org/Phosphorus.htm]Phosphorus”>http://www.lclt.org/Phosphorus.htm)</p>
<p>so its the phosphorus one, right?</p>
<p>@nritya
word!</p>
<p>Yeah phosphorous is pollution… Apparently so is overheated water</p>
<p>ozone depletion is skin cancer</p>
<p>@nritya: but the wiki page is talking about how organic pollutants deplete oxygen from bodies of water, while on the test, it said something along the lines of “because of overheating, oxygen was depleted”…</p>
<p>Whatever guys… I think I can safely say we will all get over 700, we all seem pretty knowledgeable in Bio. </p>
<p>I rue my tardiness however. I felt a nudge that I should review the eye. Those 3 questions were rape.</p>
<p>I do know transpiration is plant. Just don’t know what can fit better than it in the question. Is there eutrophication for the answer choices? I I put pollution for the phosphate anw.</p>
<p>I didnt do well. just hoping for at least 700!!</p>
<p>I think the actual parts of the eye were the pupil, the optic nerve, and the cornea. I put down two of the parts right, but I think I misidentified the cornea one.</p>
<p>^i hope so boramk</p>
<p>and yeah, i almost studied the eye. but i was like…what are the odds. there are so many other body systems for them to test on…but i put
the last one to the left was part of the nervous system
the lense (c?) focusses the light
the iris controlls how much light gets in.
idk though</p>
<p>If nritya is right, I got 2 wrongs. Damn it. I’m shooting for an 800 >"<.</p>
<p>the three answers for the eye was: Iris (control light coming in) Lens (focus image in retina) Optical Nerve (the nerve that connects the eye to the brain) find an image on the eye boramk</p>
<p>Polydactyl is “not enough info”</p>
<p>Lets say both parents were heterogeneous for it and lets say “P” represents dominant and “p” represents recessive"</p>
<p>That would result in
Pp x Pp</p>
<p>1 homozygous dominant (PP)
2 heterozygous that express it (Pp)
1 homozygous recessive that DOESN’T express (pp)</p>
<p>Clearly, it is possible for one of them to not express it.</p>
<p>^the optical nerve was e right?</p>
<p>and it seems like everyone took biology m… did anyone take e?</p>
<p>like i said, the one all the way to the left. leading to the brain</p>
<p>Did the polydactyl one talk about the older child/younger child’s alleles, or was that a different question?</p>
<p>^different one. right? that was albinism</p>
<p>@ biology</p>
<p>I don’t even remember what I chose to know if I saw a picture</p>