Answer:
Here are the answers:
a. 4 Cell determination as an issue in the *rest is missing*
b. 4 They assumed that different ways of separating an embryo into two parts would be equivalent as far as the fate of the two parts was concerned.
c. 4 I and III only
Explanation:
The passage demonstrates the importance of two factors in the development of an embryo: cleavage planes of division of embryonic cells and cell differentiation.
Cleavage Planes:
Cleavage basically refers to the division of the zygote into a large number of cells called blastomeres. Cleavage planes are geometrical lines or orientations along which cleavage takes place. Since, all embryonic cells are the precursors of some type of body cells, the cleavage planes determine if the cells are adequate for growth and development.
Cell Differentiation:
Cell differentiation is the transition of an undifferentiated cell into a specialized one. For example, stem cells are undifferentiated cells that develop into progenitor cells that mature into a specific cell lineage. For an embryo to regenerate, the presence of adequate embryonic stem cells is crucial. Embryonic stem cells are present in abundance before the gastrulation phase of embryonic development, after which they rapidly start differentiating.
It reproduces both sexually and asexually.. sexually both male and female release sperms and eggs in water ,after fertilization it forms planula which then asexually reproduce either by budding or strobilization..
Answer:
Isomerization
Explanation:
In nature, when a carbohydrate has a formula, this formula can be share with different compounds (isomers) because they have the same number of atoms of the same elements, but the arrangement is different.
For example, the formula C6H12O6, is the same for glucose and for fructose, but in living things, when they process these two molecules, they do it with two different metabolic paths. With the specific use of enzymes, the body can separate one from another. In some cases, the mistakes can occur inside a cell process, leading a different metabolic path.
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