Question

Why was an algae cell included along with the plant and animal cells?

Answer 1

Answer: Some algal (algae) species can act both as "plants" and as "animals" at the same time. As “plants” the algae produce their own food and as “animals” they can eat other plants or even their own grazers.

Answer 2

In particular, organelles called chloroplasts allow plants to capture the energy of the Sun in energy-rich molecules; cell walls allow plants to have rigid structures as varied as wood trunks and supple leaves; and vacuoles allow plant cells to change size.