Answer:
evolution of life on Earth
Explanation:
Life began on Earth at least 3.5 to 4 billion years ago, and it has been evolving ever since. At first, all living things on Earth were simple, single-celled organisms. Much later, the first multicellular organisms evolved, and after that, Earth's biodiversity greatly increased.
Answer:
<h2>D. Competitively dominant to other organisms in the ecosystem</h2>
A keystone species is an organism that helps define an entire ecosystem. Without its keystone species, the ecosystem would be dramatically different or cease to exist altogether.
<em>Hope that helps! :)</em>
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<em>-Aphrodite</em>
Explanation:
From this one migrant species would come many -- at least 13 species of finch evolving from the single ancestor.
This process in which one species gives rise to multiple species that exploit different niches is called adaptive radiation. The ecological niches exert the selection pressures that push the populations in various directions. On various islands, finch species have become adapted for different diets: seeds, insects, flowers, the blood of seabirds, and leaves.
The ancestral finch was a ground-dwelling, seed-eating finch. After the burst of speciation in the Galapagos, a total of 14 species would exist: three species of ground-dwelling seed-eaters; three others living on cactuses and eating seeds; one living in trees and eating seeds; and 7 species of tree-dwelling insect-eaters.
Scientists long after Darwin spent years trying to understand the process that had created so many types of finches that differed mainly in the size and shape of their beaks.
There are several specific characteristics for procaryote and eucaryote:
- Procaryotes has a cell wall, in addition to the cell membrane.
- procaryotes has chromatin in the cytoplasm, they do not have a nucleus.
- Procaryotes are small cells visible only at the microscope with x100 objective.
About the eucaryotic cells:
- Eucaryotes have mitochondria,
- Eucaryotes have endoplasmic reticulum
- Eucaryotes have a nucleus with DNA chromatin and nucleoli inside it.
- Eucaryotes are visible in the microscope x40
