They uncover evidence of crimes, mostly things involving dna like finger prints or blood.
Answer:
B. nutrients
Explanation:
Nutrients are chemicals present in all living things on Earth. They are essential for the lives of humans, plants, animals ,and all other species. Nutrients help remove food that provides energy to the species. Carbon, hydrogen and oxygen are the most essential nutrients which they need.
Hence, option B is correct as it is necessary for sustain the life of an organism
Because they need it to get protein and create it. Protein helps the plants grow.
I'm not sure completely but I totally think hetotrophs