Answer:
the food web
Explanation: A food web is a conceptual model that represents the flow of energy through an ecosystem.
Answer:
they compare fossils to other fossils to see if skeleton changes are observed in a species over time it indicates that there is genetic change going on within the species
C. employment and unemployment
because it is the only one that makes sense
Nucleotide is a combination of a sugar, nitrogen base and phosphate groupment
