A compound is organic if it contains carbon covalently bonded to other atoms. Most often, the other atoms include hydrogen, oxygen, and/or nitrogen. A few carbon compounds, such as simple oxides (e.g. CO2) and cyanides (e.g. KCN) are excluded arbitrarily.
It’s the first one for sure
The answer is A. Putting the aquarium in the dark means that
the aquatic plants will not be able to photosynthesize. The process of photosynthesis produces oxygen
as a by-product. The oxygen is used by the fishes in respiration and release
carbon dioxide. The carbon dioxide is used by the aquatic plants in photosynthesis.
Unicellular Organisums:
Unicellular organisms don't live as long and multicellular organisms. Unicellular organisms are smaller and they are faster at reproduction. Disadvantages- Unicellular organisms only have one cell that is used to function their entire being. Short life span, can't grow lager then multicellular organisms.
Multicellular organisums:
Intelligence and Evolution.
Bigger Is Better.
Less Stress Equals A Longer Lifespan.
Cells Can Take Care Of Each Other.
More Energy Is Needed For Normal Functioning.
Infection Becomes A Possibility When Multicellular.
Takes Longer To Reach Maturity And To Breed
