During the Tertiary Period the dominant organisms were mammals. These mammals included the many different types of dinosaurs that were roaming the earth 65 million years ago. Other organisms included bony fish such as bass and trout, flowering plants, insects, and birds.
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During the Tertiary period, dominant organisms included mammals such as early primates, rodents, horses, and whales. These mammals diversified and expanded in various environments as the climate changed, leading to the rise of new species and the extinction of others. Birds also continued to diversify during this time.
The Tertiary period happened after the extinction that took place during the Cretaceous period, so mammals saw a great diversification, the most notable of which was the movement from eating from trees to eating grass. Along with these mammals, birds also became the dominant animals in land ecosystems.
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The K-T extinction occurred at the boundary between the Cretaceous and Paleogene periods, marking the end of the Mesozoic Era and the beginning of the Cenozoic Era. Therefore, it occurred at the end of the Cretaceous period and before the Tertiary period.
A tertiary consumer in the ocean is an animal that feeds on secondary consumers, such as large fish, sea turtles, or seals. These organisms are at the top of the food chain in marine ecosystems and play a crucial role in regulating populations of lower trophic levels. Examples of tertiary consumers in the ocean include sharks, killer whales, and large predatory fish like tuna.
Organisms with alleles BB are considered homozygous dominant. This means that the dominant allele (B) is expressed in the phenotype. Dominant alleles mask the effects of recessive alleles in heterozygous individuals.