<span>The only traits that can be acted upon by natural selection are those that are controlled by ___________________</span>
Answer:
<em>No, the rock will not move.</em>
Explanation:
As the scenario in the question is depicting, the force applied on the rock by two friends is equal but in the opposite direction. As a result, as the force is equal and working in opposite directions hence, the rock will not tend to move. If the force applied by one of the friends would be greater or lesser than the rock would have moved from its position depending on the force.
The sun gets closer to the earth
Answer
Crossing over is the phenomenon in which exchange of chromtids occur between non sister chromatids and result into recombinant chromatids, which is an important tool for evolution and bring about genetic changes in offsprings as compare to their parents.
No crossing over
If no crossing over occurs, it means no exchange of chromatids between non sister chromatids of homologous chromosomes, then no recombinant chromatids will be formed.
Result
At the end of meiosis II, when four haploid cells are formed, all these cell will contain similar chromosomes as present in parent. Thus chromosomes are non recombinant because of no crossing over.
Unicellular organism are one celled but multicellular organisms are made up of many cells.
<h3>Explain the difference between unicellular and multicellular organization of organisms? </h3>
As the name suggests, unicellular organisms are made up of only one cell and this single cell carries out all the essential functions that are needed for the survival of the organism like respiration, photosynthesis etc.
But in multicellular organization, the organisms are made of more than one cells and cells are grouped according to their functions. Each group is specialized for specific functions. Even in higher multicellular organisms the group of cells form specific types of tissues and further they form organs and organ systems which function more efficiently.
Thus, this is the difference.
To learn more about unicellular organism click here:
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