Explain and provide and example of how energy flow is represented in food chains, food webs and pyramids. explain how changing a factor in an ecosystem (especially involving a keystone species) can impact this flow of energy and the ecosystem as a whole: provide an example of this in your answer.
heterotroph
autotroph
producer
food chain
consumer
energy pyramid
trophic level
food web
keystone species

Well all 3 it would start with a producer,

example:

African Iris- African Killer Bee- Anteater- Spotted Hyena-(when the hyena dies of natural causes since it is an apex predator)- Earthworm

I don't know if this is exactly what you mean, but this is the best example I can with.

that would be called plucking : )

explanation:

''plucking, also referred to as quarrying, is a glacial phenomenon that is responsible for the erosion and transportation of individual pieces of bedrock, especially large "joint blocks". as a glacier moves down a valley, friction causes the basal ice of the glacier to melt and infiltrate joints (cracks) in the bedrock."

rising temperatures because when water vapor in the air is cooled, it condenses. it turns back into a liquid and attaches to dust particles in the air. these very small water droplets group together to form clouds