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My 'best friend' and I used to be inseparable last year. But at the start of this year, we started drifting apart for no reason. She just started hanging around with other classmates, and I was fine with it since she has other friends. After a while,, she became really close with them and now...

1. How are waste products transported to and from the body cells by diffusion? 2. How are oxygen and dissolved food substances transported to and from the body cells by diffusion? 3. Red blood cells change in shape as they pass along the capillaries. They assume a bell-like shape. Suggest one...