This answer should be A !
Carbohydrates are composed of monomers or repeating subunits of simple sugars or monosaccharides, such as glucose, galactose etc.
<span>b. gravel on the bottom of the aquarium</span>
An ecosystem involves both the biological (plants, animals, human beings) and non-biological (land, water, soil, and atmosphere) community which interacts as a system. More importantly, the living things are very dependent on the abiotic community since it cannot survive by itself. Every animal, plant and human needs the primary physiological needs of water, food and shelter provided by the abiotic system. <span>
</span>
Biotic factors:
Plants
Microorganisms
Macroorganisms
There were no options but I would assume something around the lines of..
It allows for procreation
We don't exactly know the density of each of the layers of the moon, but the average density of the Moon is 3.3 g/cm3.
