Chloroplasts are the tiny structures in plants cells where photosynthesis happen. chloroplasts contain chlorophyll , a green pigment that absorb light energy for photosnthesis
(a) very frequent use of something so that it stops being effective; an over-use.
DNA (or deoxyribonucleic acid) is the molecule that carries the genetic information in all cellular forms of life and some viruses. Source-
DNA, Genes and Chromosomes — University of Leicester
www2.le.ac.uk/projects/vgec/highereducation/topics/dna-genes-chromosomes
Some energy is always lost as heat
hope that helps! :))