B - Because an active cell can only work if it has a 3-Dimension structure.
The network of glands that release chemical messengers directly into the bloodstream is called the endocrine system. The endocrine system produces and secretes t<span>hese chemical messengers, referred as </span>hormones directly into bloodstream to transmit signals to appropriate part of body. The hormones regulate bodily functions like growth, metabolism, <span>tissue function, sexual function, reproduction, </span>sleep and mood.
I would pick A hope it’s correct
Answer:
Food is prevented from entering the trachea because C
