To part A the answer is continental drift :D to Part B the answer is Mid-ocean ridges :D Hope I was helpful
<em>Full Question:</em>
<em>Which tissue is correctly paired with its primary cell type?</em>
<em>bone: fibrocyte</em>
<em>bone: osteoblast</em>
<em>connective tissue proper: chondroblast</em>
<em>cartilage: fibroblast</em>
Explanation:
<em> </em><u><em>bone: osteoblast</em></u>
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Osteoids comprise, significant sections of the entire bone matrix, and this includes fibers of collagen which give bone its flexibility and mechanical strength this allows born to resist stretching and twisting forces.
Osteoblasts are highly specialized cells within bone which formulate new bone through the production or secretion of parts of the organic matrix; this is referred to as the osteoid and mediate the calcification (fortification with allium) of osteoid during the formation of mature bone matrix.
Learn more about bone growth and development at brainly.com/question/6957100
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After hundreds or even thousands of generations both alleles for sickle cell anemia are still common in those of African ancestry. This is supported by two mechanisms: heterozygote advantage and gene flow.
Heterozygote advantage
When an allele is said to be heterozygous, it is carrying one copy of a gene. For example if one carries a copy of sickle cell allele, it will stay in the population even after many generations — natural selection will not be able to remove it and it will be passed on through generations. So, having one copy of that allele is advantageous but not deleterious.
Gene flow
With humans migrating throughout the different parts of the world, sickle cell allele is passed from one person to another or in different populations. It is actually advantageous to have one copy of this allele especially if there’s malaria in the area, which the allele is resistant.
Lactic acid is burned off by exercise, but do you need specifics or is that good enough ?
