Answer: Cellular organization.
Reproduction.
Metabolism.
Homeostasis.
Heredity.
Response to stimuli.
Growth and development.
Adaptation through evolution.
Phytoplankton can<span> be thought of as the plants of the </span>plankton<span> world. Since they photosynthesise, they </span>play<span> a big </span>role<span> in the</span>oxygen cycle<span>. ... According to National Geographic, around half of the world's </span>oxygen<span> is produced by</span>phytoplankton<span> through the process of photosynthesis</span>
They determine it because of the hypothesis. It changes during the investigation and the independent variable stays the same through the whole experiment.