Write the Topic Sentence of Each Paragraph

question 3

Essay

Write the topic sentence of each paragraph.
Located at the front of the neck, the thyroid gland produces hormones that control metabolism.If the thyroid becomes under or overactive, it can cause some serious problems.Should the thyroid become overactive, the body responds with a number of symptoms.Diarrhea, heat intolerance, anxiety, palpitations, and weight loss are just a few of the symptoms resulting from an overactive thyroid gland.However, an underactive thyroid also causes unpleasant and sometimes serious side effects.Fatigue, depression, dry skin, unusual sensitivity to cold, and hair loss are some of the symptoms that can occur when the thyroid is underactive.

---

Definitions:

Uniformitarianism

The principle suggesting that Earth's geologic processes acted in the same manner and with essentially the same intensity in the past as they do in the present, and that this consistency accounts for all geological changes.

Allopatric Speciation

Speciation pattern in which a physical barrier arises and separates populations, ending gene flow between them.

Geographic Isolation

A form of reproductive isolation in which two populations are separated by physical barriers, leading to the development of distinct species.

Rapid Evolutionary Change

A process where species undergo significant alterations in their genetic makeup over relatively short geological periods, often in response to dramatic environmental shifts.