Because it allows only certain substances to permeate. If it was totally permeable that would be good enough to having no barrier as it would let everything though. Totally impermeable means that nothing would get through.
Answer:
sure bro, ill help
the answer for question 8 is the third one
the answer for question 9 is the second one
Explanation:
question 8 - each cell is differentiated by the DNA, as DNA is the structural and functional unit of the cell, and gives it all of its own unique qualities
question 9 - nucleotides are the part of the body that sort of encode information and instruction from the center of the cell, the nucleus. and the nucleus contain the important DNA, so it is self explanatory
I think the correct answer from the choices listed above is the last option. It is the hormone oxytocin that is controlled by a positive-feedback mechanism. Oxytocin is normally produced by the paraventricular nucleus of the hypothalamus and released by the posterior pituitary.<span> Hope this answers the question.</span>
Answer:
<u><em>https://ecowarriorprincess.net/2019/02/philippines-major-problem-plastic-pollution-heres-what-theyre-doing-about-it/</em></u>
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