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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 
pinna
Natural environment; Coral reefs
A small lateral branchlet on a tentacle of an octocorallian (soft coral); the most visible portion of the outer ear of mammals.
isolecithal
Natural environment; Coral reefs
An egg cell in which the total amount of yolk is small and the yolk granules are fairly uniformly distibuted throughout the cytoplasm, and cleavage completely bisects the cell, ...
vascular plant
Natural environment; Coral reefs
Any plant containing a system of vessels which transport water and nutrients between different parts of the plant (e.g., from the roots to the leaves) .
near infrared
Natural environment; Coral reefs
Electromagnetic radiation with wavelengths from just longer than the visible (about 0.7 micrometers) to about two micrometers.
obligatory
Natural environment; Coral reefs
Obligate or required. For example, an obligatory cleaner fish relies entirely on this feeding mode to obtain nutrients; opposite of facultative.
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)