Please help me with these two questions for environmental science

Identify the level of organization that describes this statement: water,
carbon dioxide, glucose
A-Atom
B-Molecule
C-Compound
D-Element

Identify the level of organization that describes this statement: American
robins, Grey squirrels, White Oak Trees, Millipedes - all together *
A-Organism
B-Population
C-Community
D-Ecosystem

the most common energy conversion is from kinetic energy to potential energy, and then from potential energy to kinetic energy.

later on comes the heat energy, mechanical energy, and other energy conversions.

this energy conversion is so common that we can find it in our day to day lives as well.

- one of the most common energy conversions involves the changing of potential energy to kinetic energy or kinetic energy to potential energy

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.