Answer:
The correct option is <em>C. A gene is a specific segment of DNA on a chromosome</em>
Explanation:
Option A is false because a gene is a segment on a chromosome.
Option B is false because a chromosome carries many genes.
Option D is false because a gene carries a segment of DNA, not all of the DNA.
Option C is correct because there are many genes present on a single chromosome. Each gene carries a segment of DNA. The position of a gene on the chromosome is known as its loci.
It is hard to understand this question but ill give you my best answer. The hearts level of organisation to cells is immense, the heart pumps blood to every cell in the body (so they can respire) through a system of Arteries, veins and capillaries. The blood is pushed by the force of the heart through the arteries, the main (and largest) tubes for transportation to segments of the body further away from the heart. This goes into a smaller system of veins that brake off into a tree kind of pattern to reach every cell. These later brake off into the capillaries that have walls only 1 cell thick. This is how blood is transported to each cell that requires energy and oxygen to respire.
<span>The correct answer for the first question is the third statement. Researchers developing prosthetic devices have recently discovered a way to fuse patients' nerves to robotic limbs. In number two, the correct answer is the second person in the choices. Hosni Mubarak resigned the presidency of Egypt as a result of "Arab Spring" demonstrations. </span>
