it's b. anaphase and spindle fibres pulls chromosomes towards the centrioles in this phase.
The f° -f^1 complex in the mitochondrial structure helps it
Assuming you are referring to plants when you say producers, bees help spread "pollen", or plant offspring from plant to plant, which helps to fertilize those plants and help new ones grow.
If the solutions and leaf disks were boiled prior to the photosynthesis I think all the leafs would sink. Photosynthesis would not ensue by the reason the proteins would be converted and not useful.
Alternatively, if the solutions and leaf disks were subjected to very cold temperatures the leaf disk will float faster.
