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- Circulatory system (8794 bytes)
20: ...le'' circulation. The heart of fish is therefore only a single pump (consisting of two chambers). In a...
61: ... was not properly understood then. Because blood pools in the veins after death, arteries look empty. A... - History of ancient Egypt (28563 bytes)
31: ...North Africa|Northeast Africa]] ([http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed...
33: ...araoh Khufu]] (also known as [[Cheops]]), is the only surviving monument of the [[Seven Wonders of the...
50: ...ancient Egyptians (freezing, pickling etc). The only method that they were aware of was by drying the...
52: ... land fertile. when the waters subsided, it left pools of water behind which dried out in the sun. Once...
60: ...emselves as a specially selected people, "as the only true human beings on earth" ([http://www.louisvi... - Oklahoma (32092 bytes)
60: ...[EPA]] as having 11 different ecoregions (one of only 4 US states to have more than 10 ecoregions). Th...
122: The "[[Five Civilized Tribes]]" were not the only ones forced to Oklahoma. Nations such as the [[D...
153: ... the [[oil]] business began to get underway. Huge pools of underground oil were discovered in places like...
157: ... Black and American Indian voters (they were the only party to continue to resist [[Jim Crow]] laws), ...
175: ...a's liquor laws are still fairly unusual in that only 3.2 beer can be sold in grocery/convenience stor... - Evolution (27661 bytes)
33: ...emely rare or only happens under conditions very unlike those of modern Earth. The 1953 [[Miller-Urey ...
40: ...nt]]s are being deposited, the [[fossil record]] only provides sparse and intermittent information abo...
47: ...panzee]], 1.6% from [[gorilla]]s [http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed...
49: ... a steady process of degeneration[http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed...
114: ...ome closer genetically while building larger gene pools. Migration of one population into another area oc... - Lightning (33113 bytes)
35: ...m several different objects simultaneously, with only one connecting with the leader and forming the d...
65: ... One special type of intracloud lightning is commonly called an anvil crawler. Discharges of electric...
71: ... which is nothing more than a leader stroke with only one return stroke.
93: ...s date back to at least [[1886]]. However, it is only in recent years that fuller investigations have ...
117: ...lso been triggered by launching rockets carrying spools of wire into thunderstorms. The wire unwinds as t... - Atmospheric pressure (6841 bytes)
41: ...since mercury is not a substance that humans commonly come in contact with, water often provides a mor...
43: ...platform as is commonly found in Olympic swimming pools), the potential energy is approximately equivalen... - Toad (5772 bytes)
37: ...of species in other families of Amphibia are commonly referred to as toads. This is because the charac...
53: ...stages. Typically adult toads gather in suitable pools, the first to arive usually being the males. Thei... - Bottlenose Dolphin (16802 bytes)
33: The species is commonly known for its friendly character and curiosity. ...
40: Their diet consists mainly of small fish, occasionally also [[squid]], [[cr...
52: ...almost exclusively shown by females. This is the only known case of tool use in marine mammals. An ela...
57: ...t and is inserted into the vagina. The act lasts only 10-30 seconds, but is repeated numerous times, w...
88: ...much easier to spot than the tuna, fishermen commonly encircle dolphins to catch tuna, sometimes resul... - Swimming (22854 bytes)
5: ...ward relative to the body, and transverse motion only a slight propelling of water in a direction oppo...
19: ...ulsion. For beginners, increased strength brings only small improvements if the above strategies (mini...
45: ...nces of 100 m (short course 25 m pools only), 200 m, and 400 m.
58: ...ly. Much of recreational swimming takes place in pools, where the water is calm. Therefore freestyle (w...
82: ...ith the legs, [[front crawl]] propels the body mainly with the arms. - Geyser (14881 bytes)
4: ...es a favourable [[hydrogeology]] which exists in only a few places on Earth, and so they are fairly ra...
12: ...ve presses down on the hotter water beneath, not unlike the lid of a [[pressure cooker]], allowing the...
20: ... types of geyser; ''Fountain geysers'' erupt from pools of water, typically in a series of intense, even ...
26: ...ong dormant periods, eruptions were sometimes humanly-induced---often on special occasions---by the ad... - Hot spring (7271 bytes)
9: ...e Earth, it is called a [[geyser]]; if the water only reaches the surface in the form of [[steam]], it...
66: There are also hot springs in Greenland.
75: *Marjorie Gersh-Young, ''Hot Springs and Hot Pools of the Southwest: Jayson Loam's Original Guide,''...
76: * Marjorie Gersh-Young, ''Hot Springs & Hot Pools Of The Northwest,'' Aqua Thermal Access, 2003. ... - Mosquito (10897 bytes)
15: ...illimetre|mm]] (0.6 inch). Mosquitoes weigh only about 2 to 2.5 [[milligram|mg]] (0.03 to 0....
21: ...blood of mammals, including humans, which is commonly referred to as a bite. Mosquito bites often swel...
27: ...arvae, or "wrigglers," grow suspended in stagnant pools of water and breathe air through siphons in their...
28: ...fe cycle in 14 days at 20 °C (68 °F) and only ten days at 25 °C (77 °F). Some species ...
60: ...tists have added that these plants are effective only when the leaves are crushed and used. - Platypus (21900 bytes)
14: ..., and one of the four extant [[monotreme]]s, the only mammals that lay [[egg (biology)|eggs]] instead ...
30: ... Although the platypus has two separate ovaries, only the left one is functional. The other is primiti...
41: ...omen. There are grooves on her abdomen that form pools of milk, allowing the young platypuses to lap up ...
49: ...orth as the base of the [[Cape York Peninsula]]. Inland, its distribution is not well known: it is ext...
72: ...in captivity. This is a very difficult task, and only a few young have been successfully raised since ... - Beach (8328 bytes)
22: ... Where wind is the force distributing the grains inland, the deposit behind the beach becomes a '''[[d...
24: ... area. However, the drift line is likely to move inland under assault by storm waves.
48: ...beach style" pools with zero-depth entry and wave pools that recreate the natural waves pounding upon a b... - Chlorine (10751 bytes)
44: ...] dissolves 3.10 liters of chlorine and at 30 ?C only 1.77 liters.
58: ... [[1774]] by [[Carl Wilhelm Scheele]], who mistakenly thought it contained [[oxygen]]. Chlorine was gi...
61: In nature chlorine is found only as the [[chloride ion]]. Chlorides make up much...
63: ...soluble in water, so solid chlorides are usually only found in abundance in dry climates, or deep unde...
73: ...sotopes with mass numbers ranging from 32 to 40. Only three of these isotopes occur naturally: stable ... - Lithium (11359 bytes)
134: ... is the lightest metal and has a density that is only half that of [[water]]. Like all alkali metals,...
141: ...rugs. Useful amounts of Lithium for this use are only slightly lower than toxic amounts, so that the b...
165: ...[[United States]] lithium is recovered from brine pools in [[Nevada]]. Today, most commercial lithium is...
178: *[http://periodic.lanl.gov/elements/3.html Los Alamos National Laborator... - Silver (15157 bytes)
147: ... used in high voltage contacts because it is the only metal that will not arc across contacts, hence i...
166: ... a [[precious metal]] was long considered second only to [[gold]]. In [[Ancient Egypt]] and [[Middle A...
185: ...ecious metals, and a mass of silver is now worth only about 1/60 the same mass of gold. In turn, coppe...
193: ...5 million years. [[Iron]] [[meteorite]]s are the only objects with a high enough [[palladium|Pd]]/Ag r...
208: ...th copper as an agent to remove algae in swimming pools in the United States by use of electrolysis. Copp... - Frog (6440 bytes)
33: ...stages. Typically adult frogs gather in suitable pools, the first to arive usually being the males. Thei... - Desert Tortoise (5389 bytes)
24: ... adequate rainfall, they drink copiously from any pools they find, and eliminate solid urates. Adult tort...
28: ...y are incubated for 90-120 days. Hatchlings from only a few eggs out of every hundred actually survive...
36: ...sted as [[Endangered species|threatened]]. It is unlawful to touch, harm, harass or collect wild Deser... - Fire Bellied Toads (4319 bytes)
38: ...f summer. The eggs, laid in August, metamorphose only after the winter, with the toadlets attaining a ...
42: Tadpoles mainly eat [[alga]]e and higher [[plant]]s. The toadlet...
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