Could any other cell organelles have arisen through endosymbiosis?

Which of the following types of stars are dim but can have high surface temperatures? giants main sequence stars supergiants dwarfs

Agenetically engineered corn plant is approved for agricultural use. the plant produces pollen that can make its own toxins. these toxins protect the corn plant against pests and no longer require the application of chemical pesticide. what is a likely impact on the farmer of growing such a variety of corn? a- the financial costs for the farmer would be lowered since less crops would be lost to pests. b-the financial costs for the farmer would be lowered since more crops would be lost to pests. c-the farmer may be held responsible for increasing chemical pollution. d-the farmer's expenses for pest control would increase due to an increase in bee population.

Which part of the microscope controls the amount of light which shines through the lens?