Answer is Middle Paleozoic era.
Paleozoic era was in 542 Ma - 245 Ma and it has 6 periods as Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian.
360-280 Ma - forming of vascular plants with woody tissues, seeds and veins.
430 - 410 Ma - forming of jawed fishes and first amphibians.
420 Ma - forming of scorpions
360 Ma - forming of crustaceans.
Researchers may be able to induce adult cells to behave like embryonic stem cells an important advance in stem cell therapy.
Embryonic stem cells :
Embryonic stem cells are found in the inner cell mass of the human blastocyst, an early stage of the developing embryo lasting from the 4th to 7th day after fertilization. In normal embryonic development, they disappear after the 7th day, and begin to form the three embryonic tissue layers.
How embryonic stem cells are obtained?
Stem cells are now being collected from human embryos. In most cases, the embryos that are used have been aborted or left over from in vitro fertilization procedures. Although not technically feasible at this time, researchers expect that it is possible to clone stem cells from a patient's own somatic cells.
Cell therapy :
Cellular therapy (CT) is the transplantation of human cells to replace or repair damaged tissue and/or cells. With new technologies, innovative products, and limitless imagination, many different types of cells may be used as part of a therapy or treatment for a variety of diseases and conditions.
Learn more about stem cell therapy :
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So there are four types of mountains and these are fault block mountains, fold and thrust mountains, unwarped or dome mountains and volcanic mountains.
Based on the given locations above, the Sierra Nevada mountains of California are fault block mountains. The Alps of Europe is an example of a fold and thrust mountain. The Black Hills of South Dakota and Teton range of Wyoming are unwarped or dome mountains. Hope this answer helps.
Amino acids are the building units of proteins
a local health officer
The power to arrest someone who refuses to undergo treatment for a communicable disease lies with: a local health officer.
A local health officer is an individual who works with a local health department (a government agency). A local health officer is responsible for the enforcement of all public health laws, and regulations. He is also responsible for controlling, organizing, and administering all duties and operations of the health department, inclusive of the operation of laboratories, clinics, and health centers.
