Similarities: Both humans and plants have organ systems that help them survive. Humans have the circulatory system like how plants have vascular tissues (xylem and phloem) to transport water and nutrients. Both use respiration: humans breathe oxygen; plants exchange gases through stomata. Differences: Humans have digestive, nervous, muscular systems, which plants don’t have. Plants make their own food via photosynthesis, but humans need to eat. Humans move freely, but plants are rooted.