<span>The correct option is this: THE HEART BEGINS BEATING.
A fertilized egg takes about 40 weeks to reach full maturity. At week 5, the developing fetus resemble a tadpole; at this stage, the circulatory system has begin to form and the tiny heart has started beating and the baby is the size of a sesame seed. By week 6, the heart beat of the baby can fully be detected through scan.</span>
Hello!
<span>Europe (especially Scandinavia), United States (areas like New York), Southwest Canada, Southeast China, and Taiwan.
Things that cause it are SO2 emission by volcanoes and combustion of fossil fuels such as coal and oil. I would suspect in these areas that there are a lot of cars, power plants using coal or diesel, or manufacturing that is using
combustion on site.
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Hope this Helps! Have A Wonderful Day! :)
Answer:
True
Explanation:
Epinephrine and norepinephrine are the hormones secreted by the adrenal medulla and are also called adrenaline and noradrenaline, respectively. During stress conditions, the hypothalamus stimulates the preganglionic neurons of sympathetic division.
These preganglionic neurons stimulate the chromaffin cells to secrete epinephrine and norepinephrine to prepare the body for fight or flight response. The increased level of epinephrine and norepinephrine hormones in the blood is called “surge of adrenaline”
Natural selection is a specific mechanism of evolution in which the heritable traits help an organism to survive and reproduce successfully. answer B
Grade aa eggs are nearly perfect
