I think it’s b but idk i’m learning that in science as well
I think it’s true i think and D
Answer:
Its Euglena
Explanation:
Shape change from normal elongated egg-shape to round-shape in stressful environment. These shape changes attain two transition phases. The I-transition phase is reversible where the organism can return to normal if favourable environment persists.
Alveoli walls are composed of Type 1 and Type 2 alveolar cells
Circulatory System because it carries the blood throughout the body.