PH Level, and food source such as sugar.
Answer:
Trees and birds have a commensalism relationship. The birds benefit from having a place to build their nests, while the trees are unharmed and not impacted by the bird’s presence.
Explanation:
The nucleus of an atom contain protons and neutrons, which make up most of the mass of an atom.
The answer would be 2 and 3 ( 2nd answer choice)
Humans are warm blooded and can't be cold blooded because of the environment we live in. We can't sit still during the winter and soak up warmth from the sun.
