D,record observations and measurements.
The Trout are probably not used to the water and their surroundings.
Answer:
If that is a picture of DNA, then nucleic acids are the most common macromolecule
Explanation:
c. Mutualistic: both the bacteria and the bean plant benefit. Mutualism or symbiosis refers to the relationship between two organism where both are benefited. The bacteria convert nitrogen in the environment for the bean plant to use, in exchange for carbohydrates and a place for bacteria to grow, which is in the nodules of the plant.
