Cells, tree, digestive system, public transportation system, government systems, school systems, families, dog, forest, pond, prairie, communication systems, towns, insect, solar system, weather systems, bird, correctional system, squirrel, soil, etc.
Answer:
A gene is a section of a chromosome that codes for trait.The specific combination of alleles an organism has is called its genotype which affects the organisms features.
Explanation:
I belive its C
Explatatiom burning something is chemical and melting something is physical.
