About 95% of the time down syndrome is caused by “trisomy 21.”the person has three copies of chromosome 21, instead of the usual two copies, in all cells. This is caused by abnormal cell division during the development of the sperm cell or the egg cell.
Answer:
<h3>mimics the diffusion and osmosis processes of the cell membrane </h3>
<em>Like a cell membrane, dialysis tubing has a semi-permeable membrane, which allows small molecule to permeate through the membrane. Thus, the dialysis tubing</em>
Explanation:
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1. Scientists may want to get a better understanding of the natural world.
2. They want to gather more data, info, etc about a certain topic.
3. They may want to make predictions and give explanations about a topic.
Answer:
Chemical
Explanation:
The glowing is a change in color, which is a sign of Chemical Change
Answer:
Fossils show that traits change slowly over time
