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The life cycle of a gymnosperm involves alternation of generations, with a dominant diploid sporophyte phase, and a reduced haploid gametophyte phase, which is dependent on the sporophytic phase. [3] The term "gymnosperm" is often used in paleobotany to refer to (the paraphyletic group of) all non-angiosperm seed plants.
The cheetah occurs mostly in eastern and southern Africa; its presence in Asia is limited to the central deserts of Iran, though there have been unconfirmed reports of sightings in Afghanistan, Iraq and Pakistan in the last few decades. [1] [25] The global population of cheetahs was estimated at nearly 7,100 mature individuals in 2016.
Regionally extinct species in Pakistan include: Indian rhinoceros (since the 17th century) [22] Asian elephant [23] Asiatic lion [24] [25] Asiatic cheetah [26] Bengal tiger [27] Barasingha [28] Indian wild ass (since the installation of a fenced border at Sir Creek between India and Pakistan). [29] Kashmir stag (possibly extinct). [30]
The author revisits his 2000 bestseller "The Tipping Point," to examine the flip side of that earlier book's lessons about studying social change. Among the topics he covers: Cheetah reproduction.
The Asiatic cheetah (Acinonyx jubatus venaticus) is a critically endangered cheetah subspecies currently only surviving in Iran. [1] Its range once spread from the Arabian Peninsula and the Near East to the Caspian region, Transcaucasus, Kyzylkum Desert and northern South Asia, but was extirpated in these regions during the 20th century.
The Cycad Genomics Project, [30] for example, aims to understand the differences in structure and function of genes between gymnosperms and angiosperms through sampling in the order Cycadales. In the process, it intends to make available information for the study of evolution of seeds, cones and evolution of life cycle
An illustration of a cheetah cub (Acinonyx jubatus guttata) by Joseph Wolf in the Proceedings of the Zoological Society of London, 1867The Southern African cheetah was first described by German naturalist Johann Christian Daniel von Schreber in his book Die Säugethiere in Abbildungen nach der Natur mit Beschreibungen (The Mammals illustrated as in Nature with Descriptions), published in 1775.
The Northwest African cheetah (Acinonyx jubatus hecki), also known as the Saharan cheetah, is a cheetah subspecies native to the Sahara and the Sahel. It is listed as Critically Endangered on the IUCN Red List. In 2008, the population was suspected to number less than 250 mature individuals. [2]