This is by photosynthesis
by receiving it with oxygen
They cannot synthesize own food. photosynthesis gives food for them
humans benefit from photosynthesis, by receiving, obviously oxygen, which is required for cellular respiration, but plants also provide, glucose, which we heterotrophs need, to perform cellular respiration again, so we benefit by receiving oxygen and glucose, or O2 and C6H12O6.
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Animals benefit from photosynthesis by providing food rich in nutrients for the animals that eat plants (herbivores). Animals that eat other animals (carnivores) are indirectly benefitted, because they will then eat the animals that ate the plants.
Oxygen is given off as a by-product os photosynthesis
As an omnivore, I can unequivocally state that I benefit from a nice salad, asparagus, and even broccoli. There are lots of plants that I enjoy consuming. Many animals, such as fish, chickens, cows, and pigs eat plants, and are subsequently found on my dinner table. So, in a broad sense, herbivores, carnivores, and omnivores benefit from the result of photosynthesis.
Yes, it can because when they eat anything that has eaten or is an autotroph (and uses photosynthesis), then it uses the energy that organism produces
Why is it important that plants give off oxygen during photosynthesis
it creates food that they can eat because they can not make food theirselves.
Yes, grass gives off oxygen as part of the process of photosynthesis.