TRUE
Internal and external factors regulate cell division
Explanation:
Internally, hormones act as cell signals to regulate cell division. Thyroid hormone, for example, plays a role in regulating cell growth and division in the body. When the hormone is produced in higher concentrations by thyroid glands, it spurs cell division and vice versa.
External factors include aspects like nutrition. If the cell is able to gather enough nutrition from its environment, then it is capable of carrying out several cycles of cell division. However, when resources are limited, cell division is limited to a few cycles. This is why denying babies good nutrition during their early childhood results in stunted growth.
Learn More:
For more on cell division regulation check out;
brainly.com/question/11671928
#LearnWithBrainly
<h2>Pericardium </h2>
Explanation:
Pericardium is the fibrous tissue that surrounds the heart and the roots of the great blood vessels
The pericardium's outer coat is called the parietal pericardium which is tough and thickened, loosely cloaks the heart, and is attached to the central part of the diaphragm and the back of the breastbone
Its inner coat is called the visceral pericardium or epicardium which is double, with one layer closely adherent to the heart and the other lining the inner surface of the outer coat
The intervening space between these layers is filled with pericardial fluid
This small amount of fluid acts as a lubricant to allow normal heart movement within the chest
Answer: C) the genes of this phage were made of DNA.
Explanation: the experiment described above wherein a radioactively labeled bacteriophage was allowed to infect bacteria ultimately led to the conclusion that the genes of the bacteriophage under study were made of DNA (a biopolymer of deoxyribonucleic acid, which is a type of nucleic acid composed of four different chemical groups, called bases: adenine, guanine, cytosine and thymine). Simply put, the experiment shows that the genetic material of the phage is DNA.