- habitat
- The environment in which an organism lives. Habitat can also refer to both the organisms and physical environment in a particular place.
- hemisphere
- One half of a sphere or globe. On Earth the northern hemisphere is divided from the southern hemisphere by the equator.
- herbivory
- Eating of grasses and forbs (herbs)
- heterostyly
- The coexistence of genetically controlled hermaphrodite flowers with different style lengths, and usually with reciprocal anther positions.
- hibernation
- The dormant, sleeplike state, with a lower body temperature and slower heart and breathing rate that is characteristic of various animals during the winter months in cold climates. Before going into hibernation, animals will store fat in their bodies. Hibernators do arouse from hibernation periodically, but usually stay in their hibernation chamber or nest.
- hogback
- A narrow ridge, underlain and controlled by a resistant bed dipping at some 40 degrees or more
- Holocene
- About the last 11'000 years. In general, the Holocene is the relatively warm period after the last ice age.
- home range
- The area in which an animal or group spends the majority of its time
- hot spot
- An area with an unusual concentration of species, many of which are endemic to the area
- hotspot
- A center of attraction or richness (e.g. in species)
- humic
- Rich in humus (dark) and often associated with low pH
- hybridise
- Genetic crossing commonly related species of the same genus
- hydrosphere
- The envelope of gaseous, liquid, and solid water on the earth, including oceans, lakes, groundwater, ice and snow, and water vapor
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