I believe it’s circulatory system.
Answer:
The rotation of the moon and sunlight reflection causes the different phases of the moon.
Answer:
Investigation: a searching inquiry for gathering detailed facts...
Experiment: an orderly procedure carried out with the goal of verifying , refuting or establishing the valitity of a hypothesis.... .
Explanation:
Sadanvama1979 GREETINGS
Answer:
By using specialized external systems.
Explanation:
To maintain homeostasis, unicellular organisms grow, respond to the environment, transform energy, and reproduce.
