Image result for how does vascular system serve the needs of plant cells
Xylem and phloem make up the big transportation system of vascular plants. As you get bigger, it is more difficult to transport nutrients, water, and sugars around your body. ... The bottom is a system of roots. Each needs the other to survive.
Yes, new drugs can be made by making small chemical changes to drugs that already exist. Antibiotics are a good example of this. penicillin was discovered in fungi and now there's an entire class of "icillin" antibiotics like amoxicillin and ampicillin.
Horsetails feel gritty because their stems contain silica
