Algae live inside the body cells of a species of hydra. The hydra uses the products of the alga's
photosynthesis. Ammonia resulting from the hydra's
metabolism is thought to contribute to the algae's
nutrition.
The relationship between the hydra and the alga is
best described as
1) commensalism
3) saprophytism
2) mutualism
4) parasitism

Put each tile to the correct location. categorize each term as something that is typical of a scientific theory, a scientific hypothesis, or both. 1) scientific theories 2) both 3) scientific hypothesis a). a tentative statement used to guide scientific investigations b). makes predictions about future events c). can be tested many independent researches d). based on observations of natural phenomena e) . a well-established highly reliable explanation