They are called circadian rhythm. Circadian rhythms are physical, mental and behavioral changes that follow a repeated daily cycle. They are usually biological processes that display an oscillation of about 24 hours and occurs in animals, plants and even cyanobacteria. The process responds to changes in light and darkness in the surroundings of an organism.
The answer is water table. Water table is the boundary
between vandose zone and the zone of saturation. The unsaturated is the vandose
while the saturated is the groundwater zone. Water table is located in the top
of an unconfined aquifer, that can tell the level below which soil and rock are
saturated with water and the top of the zone that is saturation.
Hi! Spores are produced by sporophyte, or the spore bearing generation. Spores can be found in non seed bearing plants; like liverworts, hornworts, mosses and ferns. In ferns, you could physically find spores on the underside of the frond. These sporangia may clump together as well, to form sori. I hope this helps, let me know if you have more questions!
In any habitat, a keystone species is one that has a major impact on that ecosystem. If that creature were removed, the changes would be nearly immediate and extremely noticeable. Both predators and prey can be keystone species, and are key to maintaining ecological balance.
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