Answer:
The answer should be "by an increase in the weathering of rocks that contribute to the mineral makeup of soil"
Explanation:
The rate of soil formation can be accelerated by an increase in the weathering of rocks that contribute to the mineral makeup of soil. Topsoil can be increased through the increase of available organic material. Erosion can also lead to an increase in available parent material for soil formation.
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Answer:
Matrix of blood
Explanation:
Plasma is known as the upper phase, obtained after centrifugation of the blood. It is essentially the matrix of the blood: water, sugars, salts and small proteins. The rest of the larger components, such as platelets, red and white blood cells will remain in the lower phases, depending on their size and mass.
The answer is the third one, mitochondrial DNA can be traced for generations. this is because geneticists could trace back mitochondrial adam and mitochondrial eve.
Answer:
C - Contains the embryonic disk
Explanation:
After an egg is fertilized, it begins to divide into smaller cells, from the 1 cell stage, to 2, to 4 and so on. Then, on the third day, the cells fall within 16-200 cells and it is then called a <em>morula</em>.
On the fifth day, the morula becomes a ball of calls which is now differentiated into an <em>inner cell mass and a trophectoderm</em>. The inner cell mass becomes the <em>embryo</em> as development goes on and the trophectoderm, becomes the <em>placenta</em>.
As development goes on further, the floor of the amniotic cavity is formed by the embryonic disk, a layer of prismatic cells derived from the inner cell mass.
The embryonic disc develops into 3 layers:
There is a major differentiation of cells which gives a template for the origin of development of specific organs of the embryo.
