4.6 billion years ago
The study pushes back the clock on the origin of Earth's water by hundreds of millions of years, to around 4.6 billion years ago, when all the worlds of the inner solar system were still forming. Scientists had suspected that our planet formed dry, with high-energy impacts creating a molten surface on the infant Earth.
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Answer:
sympathetic stimulation
Explanation:
Under stress or emergency conditions, the preganglionic neurons of the sympathetic division release acetylcholine. Acetylcholine stimulates secretion and release of epinephrine and norepinephrine from the adrenal medulla. These hormones enhance the effects of the sympathetic division of the autonomic nervous system (ANS) during stress. Epinephrine and norepinephrine augment the fight-or-flight response as they increase the heart rate and force of contraction, the output of the heart, and blood pressure. They also increase blood supply to the heart, liver, and adipose tissue. The airways to lungs become dilated and there are increase blood levels of glucose and fatty acids.
Answer:
Prophase, Meataphase, Anaphase and Telophase
Explanation:
Prophase-
The chromosomes begin to condense and the nuclear envelope breaks down.
Metaphase-
Pair of homologous chromosomes move to the eqautor of the cell.
Anaphase-
Homologous chromosomes move to the opposite poles of the cell.
Telophase-
Chromosomes gather at the poles of the cells. Cytoplasm divides.
