Both a and b. Protists can be heterotrophic (organisms that get their nutrition from complex substances) or autotrophic (organisms that make their own nutritional substances).
Decomposition of hydrogen peroxide
The decomposition (breakdown) of hydrogen peroxide (H2O2) to form water (H2O) and oxygen gas (O2) is an example of chemical change.
Umm.. well if if you talk about the cell level then the organelles would be cell wall, plastid and a large central vacuole. However if you talk about finding them visually, Leaves, roots and flowers. Pretty simple dude.
