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.
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To comprehend how living things originated, scientists study the anatomy, embryos, and DNA of various species. Homological structures provide proof of evolution. These are features that were passed down from a common ancestor and are shared by related creatures. An further piece of evidence for evolution is offered by similar structures.
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