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Natural environment
Related to any physical feature of the earth's natural environment.
17Categories 71833Terms
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Natural environment > Coral reefs 
self-fertilization
Natural environment; Coral reefs
When a sperm cell and ovum from the same organism fuse and form a zygote.
race
Natural environment; Coral reefs
A population differing from others; refers to a unit below the subspecies level which is not given a taxonomic name.
karst
Natural environment; Coral reefs
A limestone terrain characterized by sinks, caverns, abrupt ridges, protuberant rocks and drainage characteristics due to greater solubility of limestone in natural waters than is ...
pustule
Natural environment; Coral reefs
A pimple- or wart-like projection; a bump or raised knob on the outside surface of a mollusk shell.
marsh
Natural environment; Coral reefs
A soft, wet area periodically or continuously flooded to a shallow depth, usually characterized by a particular group of grasses, cattails and other low plants.
centrolecithal
Natural environment; Coral reefs
A type of egg cell that has its yolk in the very center of the cytoplasm, such that the initial meroblastic cleavage of the zygote happens all around the embryo. Most arthropods ...
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)