Final answer:
Both bacteria and algae possess defined boundaries through cell walls, with bacteria having peptidoglycan-based walls and algae having walls typically made of cellulose.
Step-by-step explanation:
Regarding the question of whether bacteria and algae have defined boundaries, the answer is yes for both. Bacteria, being prokaryotic organisms, have cell walls composed of peptidoglycan that serve as a defined boundary, providing shape and protection. They can sometimes have an additional outer layer called a capsule. Algae, on the other hand, are generally eukaryotic organisms and have cell walls made of various substances including cellulose, which also give them defined boundaries. Therefore, the correct option for the student's question is (c) Yes for both bacteria and algae.