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Natural environment
Related to any physical feature of the earth's natural environment.
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Natural environment > Coral reefs 
ancestor
Natural environment; Coral reefs
Any organism, population, or species from which some other organism, population, or species is descended.
equinox
Natural environment; Coral reefs
Either of the two times during a year when the sun crosses the celestial equator and the length of day and night are equal.
ostium
Natural environment; Coral reefs
In sponges, a microscopic pore through which water enters the sponge body.
parts per thousand (ppt)
Natural environment; Coral reefs
Number of parts of a substance found in one thousand parts of a particular gas, liquid, or solid.
autotrophic
Natural environment; Coral reefs
Relating to organisms that have a type of nutrition in which organic compounds used in metabolism are obtained by synthesis from inorganic compounds.
chlorophyll b
Natural environment; Coral reefs
The chlorophyll generally characteristic of higher plants and green algae.It is absent in other types of algae.
enterocoelous
Natural environment; Coral reefs
The mesoderm and coelom initially develop as pouches off of the primitive digestive tract (archenteron) of an embryo. Enterocoelous development of the coelom occurs in ...
Sub-categories
- Air (43)
- Atmosphere (59)
- Climate (1147)
- Climate change (10457)
- Coral reefs (23903)
- Deserts (738)
- Earthquake (7143)
- Flood (34)
- Forests (37)
- Grassland (35)
- Land mass (144)
- Landslide (66)
- Mountains (203)
- Plateau (39)
- Speleology (1857)
- Volcano (5852)
- Water (18527)