CAYTONIA is an extinct plant that existed 200 to 140 million years ago. It has reproductive structures that resemble
reproductive structures in modern flowering plants. How do
scientists know about the structures in an ancient extinct
plant?
Scientists study DNA structure of CAYTONIA
Scientists genetically engineer modern plants to produce CAYTONIA.
O Scientists excavate and examine fossilized remains of CAYTONIA.
Scientists observe the adaptations of plant in habitats resembling
those of CAYTONIA.

individual oxygen atoms are formed during photosynthesis.-c.

dz nuts.   eeneneneeenenne

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.