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Beginning of animal evolution. [54] [55] 720–630 Ma Possible global glaciation [56] [57] which increased the atmospheric oxygen and decreased carbon dioxide, and was either caused by land plant evolution [58] or resulted in it. [59] Opinion is divided on whether it increased or decreased biodiversity or the rate of evolution. [60] [61] [62 ...
The history of life on Earth traces the processes by which living and extinct organisms evolved, from the earliest emergence of life to the present day. Earth formed about 4.5 billion years ago (abbreviated as Ga, for gigaannum) and evidence suggests that life emerged prior to 3.7 Ga. [1] [2] [3] The similarities among all known present-day species indicate that they have diverged through the ...
Artificial selection is the controlled breeding of domestic plants and animals. Humans determine which animal or plant will reproduce and which of the offspring will survive; thus, they determine which genes will be passed on to future generations. The process of artificial selection has had a significant impact on the evolution of domestic ...
Convergent evolution—the repeated evolution of similar traits in multiple lineages which all ancestrally lack the trait—is rife in nature, as illustrated by the examples below. The ultimate cause of convergence is usually a similar evolutionary biome , as similar environments will select for similar traits in any species occupying the same ...
Genetics do not support subspecific differentiation between the Cape lion and living lions in Eastern Africa; if placed in a single subspecies, it would be P. l. melanochaita because of being the older name. [297] 1866 [298] Siau scops owl: Otus manadensis siaoensis: Siau Island, Indonesia Deforestation. [71] 1867 [299] Eastern elk: Cervus ...
Squids are shrinking, birds are migrating and lizards are getting blown away by hurricanes. The signs are everywhere; animals are changing because of climate change. We asked biologist Thor Hanson ...
(Fig. 2c) Evolution has caused enlargement and modification of these structures in some species, while it has caused the reduction and loss of them in other species. The modifications enable the insects to exploit a variety of food materials. Insect mouthparts and antennae are considered homologues of insect legs.
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