Importance:
Oxygen is the third most abundant element and constitute about 21% of the gases in earth's atmosphere. It is a key for generating energy in cellular respiration. In aerobic respiration, electron release in electron transport chain is culminated by oxygen, result into the production of chemical energy.
Oxygen obtained by human:
Human obtain oxygen through respiratory system by applying partial law of diffusion.The partial pressure of oxygen in atmosphere is higher than inside lungs, so oxygen move into lungs in exchange for carbon dioxide.
Oxygen obtained by flatworms:
Oxygen obtained by ferns:
Answer:
Lava defines the external state of magma on the surface of the Earth. Magma is what describes the internal molten rock and minerals of Earth.
Answer: Commensalism (Symbiotic relationship)
Explanation:
Commensalism is a type of symbiotic relationship in which one species gets benefits while the other species remain unaffected.
Orchids are epiphytes which grows on the inner branches of trees of rainforest that helps in taking nutrients directly from the air around them and sometimes from the decaying organic matter of their host tree. Epiphytic orchids stores water in their stems and compensate in dry periods. Trees having rough barks that holds humus and water in it's crack supports orchids better than other trees with smooth barks.
I hope this help, answer is 125.5kcal♀️