This simple concept describes the process by which cells exchange toxic gases for life-sustaining gases. It also describes how nerve cells are able to send electrical signals to each other cells. Diffusion tells embryonic cells where to crawl and when they have arrived. Diffusion also makes it possible to reduce the loss of body heat to the surrounding environment.
22 ) organelles are the tiny structures that carry out life activities !
23)mitosis as in this no variation takes place !
24) dominant trait.
and I am sure for all the three and suggest you to go for that !!!
Physical - Sodium is solid at room temperature
Chemical - sodium is hydroscopic in nature
