Answer:
Melanin is responsible for black colour of hair.
Explanation:
Hair is black in colour because it is determined by the amount of a pigment present in hair is called melanin. If eumelanin which is a type of melanin, present in hair, it gives people black or brown hair. If the receptor is not activated or is blocked in the hair, then melanocytes make pheomelanin instead of eumelanin and then the black or brown hair colour did not occurs so we can conclude that melanin is responsible for black colour of hair.
Answer:
Because you need energy.
Explanation:
When you eat carbs before any event that consists of running or any other activities, the carbs will fuel you up. Carbohydrates give you energy for a long period of time.
Answer:
Energy from the Sun heats the atmosphere. ... Some of the sunlight that reaches Earth's surface is absorbed. The energy from this light heats the substance that absorbs it. The sand can become warm or even hot as it absorbs some of the sunlight that hits it.
Explanation:
The thyroid gland regulates the body's metabolism (through T3 and T4) and also affects the metabolism of calcium through the production of calcitonin, which reduces calcium concentration of the blood.
The parathyroid glands, which are located within the thyroid gland, also affect the metabolism of calcium by producing parathyroid hormone PTH, which increases calcium concentration of the blood.
Population growth is the increase in the population number of a given species in a time. Longevity, migration and fertility rates affect population growth.
<h3>What are the factors affecting population growth?</h3>
<u>Increased Longevity</u> has impacted the population growth as the life expectancy has resulted in the accumulation of more people as their age of living has increased.
<u>International Migration</u> can affect the population growth positively and negatively as moving of the person from one region will decrease its population growth while the region where they go will have increased population.
<u>Fertility Rates</u> has a great impact on the population as the fertility rate had decreased due to many factors and the population has declined.
Therefore, option A. longevity option B. migration and option C. fertility rates influence the population growth.
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