Division Bryophyta









(tr)G.R. Roberts, (l)Ralph Reinhold/Earth Scenes, (br)Scott Johnson/Animals Animals


(tr)G.R. Roberts, (l)Ralph Reinhold/Earth Scenes, (br)Scott Johnson/Animals Animals

Phylum Chordata

Phylum Nematoda round, bilaterally symmetrical body; have digestive system with two openings; free-living forms and parasitic forms; roundworms

Phylum Mollusca soft-bodied animals, many with a hard shell and soft foot or footlike appendage; a mantle covers the soft body; aquatic and terrestrial species; includes clams, snails, squid, and octopuses

Phylum Annelida bilaterally symmetrical worms; have round, segmented bodies; terrestrial and aquatic species; includes earthworms, leeches, and marine polychaetes

Phylum Arthropoda largest animal group; have hard exoskeletons, segmented bodies, and pairs of jointed appendages; land and aquatic species; includes insects, crustaceans, and spiders

Phylum Echinodermata marine organisms; have spiny or leathery skin and a water-vascular system with tube feet; are radially symmetrical; includes sea stars, sand dollars, and sea urchins

Phylum Chordata organisms with internal skeletons and specialized body systems; most have paired appendages; all at some time have a notochord, nerve cord, gill slits, and a postanal tail; include fish, amphibians, reptiles, birds, and mammals

Martin Harvey/DRK Photo

Pronunciation Key

Use the following key to help you sound out words in the glossary.

Cómo usar el glosario en español:

1. Busca el término en inglés que desees encontrar.

2. El término en español, junto con la definición, se encuentran en la columna de la derecha.

back (BAK)


. . . . food (FEWD)

day (DAY)


. . . . pure (PYOOR)

father (FAH thur)


. . . . few (FYEW)

flower (FLOW ur)


____comma (CAH muh)

car (CAR)

u (+ con)____

. . . . rub (RUB)

less (LES)


. . . . shelf (SHELF)

leaf (LEEF)


. . . . nature (NAY chur)

trip (TRIHP)


. . . . gift (GIHFT)

idea (i DEE uh)


. . . . gem (JEM)

go (GOH)


. . . . sing (SING)

soft (SAWFT)


____vision (VIH zhun)

orbit (OR buht)


. . . . cake (KAYK)

coin (COYN)


. . . . seed, cent (SEED, SENT)

foot (FOOT)


. . . . zone, raise (ZOHN, RAYZ)

^Englishj a ar or abiotic: nonliving, physical features of the environment, including air, water, sunlight, soil, temperature, and climate. (p. 36) acid precipitation: precipitation with a pH below 5.6— which occurs when air pollutants from the burning of fossil fuels react with water in the atmosphere to form strong acids—that can pollute water, kill fish and plants, and damage soils. (p. 103)

acid rain: forms when sulfur dioxide and nitrogen oxide from industries and car exhausts combine with water vapor in the air; can wash nutrients from soil and damage trees and aquatic life. (p. 135)

atmosphere: air surrounding Earth; is made up of gases, including 78 percent nitrogen, 21 percent oxygen, and 0.03 percent carbon dioxide. (p. 37)

abiótico: características inertes y físicas del medio ambiente, incluyendo el aire, el agua, la luz solar, el suelo, la temperatura y el clima. (p. 36) lluvia ácida: precipitación con un pH menor de 5.6— lo cual ocurre cuando los contaminantes del aire provenientes de la quema de combustibles fósiles reaccionan con el agua en la atmósfera para formar ácidos fuertes—que puede contaminar el agua, matar peces y plantas, y dañar los suelos. (p. 103) lluvia ácida: se forma cuando el dióxido de azufre y el óxido de nitrógeno derivados de la industria y de los escapes de los automóviles se combinan con vapor de agua en el aire; puede arrastrar nutrientes del suelo y causar daño a los árboles y a la vida acuática. (p. 135) atmósfera: aire que rodea a la Tierra; está compuesta de gases, incluyendo 78% de nitrógeno, 21% de oxígeno y 0.03% de dióxido de carbono. (p. 37)

a biodiversity: variety of life in an ecosystem, most commonly measured by the number of species that live in a given area. (p. 126)

biodiversidad: variedad de vida en un ecosistema, comúnmente cuantificada mediante el número de especies que viven en un área determinada. (p. 126)

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