Down syndrome is a third chromosome in the 21st pair.
Answer:
Question 1-Bubbles
question 2-balanced because of the law of conservation of matter and energy
question 3-atomic number
question 4-buffers prevent pH changes in body system
question 5-metal and non metal
Answer:
The Cell Membrane.
Explanation:
To enter or leave a cell, the substance must pass through the cell membrane. (plasma membrane)
Answer: plasma
Explanation:
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