The proteins in the cell membrane allow the nutrients to go and waste to go out <span>of a cell. Water passes through the cell membrane without the help of proteins.</span>
You have to first make some observations and then ask a question. Then you make a hypothesis (or guess) what the answer is - do the experiment to see if you're right!
So dark linen thread structure is chromosome that we see. And and by molecule heritage that we contain.
What cells are you talking about?
Answer:
It is thin tissue that lines the alveoli
Hope this helps.
