Lettuce> greenfly> ladybird> thrush> cat
name the producer in the food chain.

Lettuce

Explanation:

Lettuce is a plant, therefore it makes its own food through photosynthesis. Since it does this, we call it a producer or an autotroph.

his research revealed two genetically different groups of prokaryotes, which justified splitting kingdom monera into two kingdoms. the genetic and cellular differences were so great, that these two kingdoms were eventually placed into different domains in the current three-domain system.

it's c. (to reduce the greenhouse effect/carbon gasses)