Describe where dna is found in a human cell (2 marks)

DNA is found in the nucleus of human cell

Explanation:

Animal cell comprises of different organelles that performs different functions ranging from golgi body, cell membrane, food vacuole, nucleus, mitochondria,  endoplasmic reticulum among others. Nucleus houses the nucleolus which houses the DNA that contains the gene passed from parent to offspring.

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.