There is one extra 21 comosome which is why it is down sydrome.
Answer:
lots of carbon dioxide and cold temperatures
Explanation:
<em>Calcium carbonate has low solubility at room temperature and the solubility increases as the temperature decreases. The solubility of calcium carbonate also increases in water with high level of carbon dioxide due to the formation of more soluble bicarbonate. </em>
<em>
</em>
<em>This is why carbon dioxide rich rainwater is able to erode limestone rocks, leading to the formation of caves, stalactites and other structures in the long run as a result of reversal of the process.</em>
<em />
So many new species were being discovered, it was impossible to arrange them all in a hierarchy based on relative complexity of species.
Answer:
the endocrine and central nervous systems
Explanation:
The ultra sound waves coming from the transmitter pass through the body and once they hit a boundary (the baby) they are partially reflected back to the transmitter and the image appears on the screen. The longer the time taken is to reflect, the further away it is, so darker/lighter on the picture.