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- Body cavity (2315 bytes)
1: ... coelom contains major organs, including the [[digestive system]], [[heart]], [[kidney]]s, etc. The co...
3: ...[[Chordate]]s and echinoderms are both Deuterostomes.
7: ... the classification of, for example, the vertebrates.
9: ...hat the coelom may have evolved from gastric pouches ("stomachs" sort of) in [[cnidaria|cnidarians]]. - Hair (11457 bytes)
2: ...ugh in some species hair is absent at certain stages of life. "Hairs" are also found on plants, the te...
4: ...ndividual; in some mammals, the pigmentation changes with the seasons, becoming white during the snowy...
6: ... [[1918]] exposed men to [[lice]] and [[flea]] infestation which caused the order to be given for the ...
8: The hair of non-human animal species is commonly referred to as ''[[fur]]''.
11: ... people [[shave]], style or adorn their hair for aesthetic reasons. - Exoskeleton (3839 bytes)
1: ...ems which provide rigidity and shape to their bodies.
3: ...ms are also used for medical and industrial purposes. Human exoskeletons are a feature of science fict...
6: ===Types of exoskeletons===
18: ...th. To overcome this, arthropods go through a process called [[moult]]ing in which they shed their exo...
20: ...ace-area ratio; or whenever organism growth requires an enlarged exoskeleton. - Nerve (2497 bytes)
1: ...ally imprecise since many neurons do not form nerves.
2: ...while '''[[efferent nerve fiber|efferent]]''' nerves conduct stimulatory signals ''from'' the brain t...
4: ...ng electrical waves, which begin typically in the cell body of a [[neuron]] and propagate rapidly down t...
8: ...(afferent) receive input from sensory organs. Nerves can also be ''mixed'', containing both efferent ...
10: ...ave the spinal cord through the ventral (i.e. closest to the belly) horn. The [[cranial nerve]]s do n... - Biological life cycle (3738 bytes)
1: ...n to the haploid stage, [[meiosis]] occurs (see [[Cell division]]).
3: The cycles differ in the product of meiosis, and if [[mitosi...
9: ...(e.g., male and female) from these individuals or cells fuse to become a zygote.
11: In the whole cycle, zygotes are the only diploid cell; mitosis occurs only in the haploid phase.
13: The individuals or cells as a result of mitosis are '''haplonts''', hence this life... - Ploidy (4598 bytes)
1: ...lyploidy]], is not uncommon in healthy plant species.
3: ...mple the euploid number of chromosomes in a human cell is 46.
6: ...''' in [[Greek language|Greek]]) [[cell (biology)|cell]]s bear one copy of each [[chromosome]].
8: ...organisms that only ever have one set of chromosomes, the term '''monoploid''' can be used interchanga...
10: ...hoosing" one homologue, resulting in haploid germ cells ([[sperm]] and [[ovum]]). - Chromosome (12667 bytes)
1: ...the two chromatids touch, and where the microtubules attach. (3) Short arm. (4) Long arm.]]
2: ...]] proved that chromosomes are the carriers of genes.
4: == Chromosomes in eukaryotes ==
5: .... The ends of the chromosomes are special structures called ''[[telomere]]s''. DNA replication begins ...
7: ==Chromosomes in bacteria== - Bee (11175 bytes)
1: {{Taxobox_begin | color = pink | name = Bees}}
11: ...subdivision | color = pink | plural_taxon = Families}}
27: ... of thirteen segments in males and twelve in females. They have two pairs of wings, the back pair bein...
29: ...lower, but the bulk of it is carried back to the nest to feed brood. The apex of the female abdomens a...
31: ... have evolved separately in different groups of bees. - Flowering plant (29088 bytes)
7: ...ightgreen | plural_taxon = [[Class (biology)|Classes]]}}
16: ...mnosperm]]s. From that time onwards, so long as these Gymnosperms were, as was usual, reckoned as dico...
18: ... Gymnosperms, and as including therefore the classes of Dicotyledons and Monocotyledons. This is the s...
22: ...t or climbing in habit, shrubs and trees, and representing a much greater variety than is to be found ...
24: ... plants recognizable as belonging to modern families (including [[beech]], [[oak]], [[maple]], and [[m... - Pollen (5420 bytes)
3: ...p of three cells is surrounded by a [[cellulose]] cell wall and a thick, tough outer wall made of [[spor...
5: ... of pines, firs, and spruces are winged. The smallest pollen grain, that of the [[Forget-me-not]] plan...
7: ...enerative cell) is cut off, leaving a larger tube-cell.
9: ...sperm-cells. The male-cells are carried to their destination in the tip of the pollen-tube.
15: ... most often entomophilous and do not cause allergies. - Queen bee (6221 bytes)
1: ...ne adult, mated queen, who is the mother of the bees of the hive, although there are exceptions.
4: ...Queen larva floating on royal jelly in open queen cell.]]
6: ...cially constructed cell, which is larger than the cells of normal brood comb, and also is oriented verti...
8: ... cell opened to show queen pupa (with darkening eyes).]]
10: {| border="1" cellpadding="2" - Ceramics (15941 bytes)
1: ...s. This article will explore the history, techniques, cultural significance, and contemporary relevanc...
7: ...s, reflecting both functional and aesthetic purposes.
10: ...ement, leading to more uniform and sophisticated designs.
12: ...or its red and black figure techniques, while Chinese ceramics are famous for their porcelain, a signi...
13: ==Techniques in Ceramics== - Ivory (4783 bytes)
5: ...e any mammalian teeth or tusks of commercial interest which is large enough to be carved or [[scrimsha...
9: ...ps, have evolved from teeth and give certain species an evolutionary advantage. The teeth of most mamm...
11: Teeth and tusks have the same physical structures: [[pulp]] [[cavity]], [[dentine]], [[cementum]] a...
13: ...ee dimensional configuration of the dentinal tubules is under genetic control and is therefore a chara...
15: ...icially carved, thus retaining their original shapes as morphologically recognizable objects. - Science (19868 bytes)
4: There are different theories of what "science" is.
6: ... and "predictive" — they predict empirical results that can be checked and [[Falsifiability|poss...
8: ...gh which they exercise those powers, and the sources of those powers in terms of the thing's structure...
10: ...ation]] is impossible and that scientific hypotheses can only be falsified ([[falsification]]).
12: [[Positivism]], a form of empiricism, advocates using science, as defined by empiricism, to gover... - Sex (2995 bytes)
1: ...t during its life cycle, and not of the mating types, which genetically can be more than two.
5: ...ant]]s, [[flower]]s bear the gametes. In some cases, flowers may contain only one type of gamete whil...
8: ...g. earthworms), all individuals are [[hermaphrodites]], that is, individuals that have male and female...
10: ...ental factors such as temperature. Yet other species change sex during their lifetime. - Antarctica (14761 bytes)
4: ...g the [[Earth]]'s [[South Pole]]. It is the [[coldest place on earth]] and is almost entirely covered ...
6: ...tains a southern continent that bears a possible resemblance to the Antarctic coast. (See also [[Histo...
8: ...ty]] of any continent on Earth, as well as the lowest average temperature.
15: Antarctica is the coldest place on earth. [[Weather pattern|Weather front...
24: ...idian]]. Western Antarctica is covered by the [[West Antarctic Ice Sheet]]. - Zimbabwe (16088 bytes)
1: ...South Africa]] to the south, [[Botswana]] to the west, [[Zambia]] to the north and [[Mozambique]] to t...
2: {| border=1 align=right cellpadding=4 cellspacing=0 width=300 style="margin: 0 0 1em 1em; ba...
6: {| border="0" cellpadding="2" cellspacing="0"
22: | '''[[President of Zimbabwe|President]]''' || [[Robert Mugabe]]
24: ...sp;- Total<br> - % water || [[List of countries by area|Ranked 59th]]<br>390,580 [[km²]]<br>... - Pakistan (74854 bytes)
9: ...anthem = [[Pak sarzamin shad bad]]<br>(Blessed Be The Sacred Land) |
10: official_languages = [[Urdu language|Urdu]], [[English languag...
14: ...der_titles = [[President of Pakistan|President]]<br />[[Prime Minister of Pakistan|Prime Mi...
15: leader_names = [[Pervez Musharraf]]<br />[[Shaukat...
16: largest_city = [[Karachi]] (also [[financial... - Chameleon (4625 bytes)
16: ''[[Brookesia]]''<br>
20: ...lso because of their elongated tongue and their eyes which can be moved independently of each other. T...
22: ==Pictures and Clipart==
23: .../Turtles_and_Tortoises Turtle and Tortoises Pictures]
24: ...n/kids/imageFolio.cgi?direct=Animals Animal Pictures] - Feather (5296 bytes)
2: ...g characteristic that distinguishes the Class [[Aves]] from all other living groups. Other [[Theropoda...
5: ...ry light, a bird's plumage weighs two or three times more than its skeleton.
7: ... fluffy because they lack barbicels, so the barbules float free of each other. At the base of the feat...
9: ...ed through the same follicle from which the old ones were fledged.
11: ...g off from the ends of the barbules. These particles produce a [[powder]] that sifts through the feath...
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