Answer:
abiotic factors refer to non-living physical and chemical elements in the ecosystem like water, air and sunlight.
biotic factors are living ot once-living organisms in the ecosystem like humans and animals
basically biotic is alive and abiotic is not alive
Because cellulose is a complex polysaccharide which is essential in dietary functions. Since we don't have the enzymes that digest cellulose, it passes through our gut unchanged hence form an important roughage which aids in preventing constipation as well as smooth movements of our intestines.
I'm not sure what the options were, but a cell would die if it didn't have enzymes. :)
The cell wall of <em>Mycobacterium </em>is accountable for its slow growth, being <em />strongly impermeable to nutrients, and for its compact, wrinkled appearance in colony morphology. Most nutrients are hydrophobic such as certain fats and vitamins as well as some form of carbohydrates and proteins. Since the cell wall is hydrophobic, nutrient absorption of <em>Mycobacterium</em> is slow hence growth of the organism is also slow. A wrinkled colony appearance is also characteristic of microorganisms with hydrophobic cell walls.
On the other hand, while <em>Mycobacterium</em> is an aerobic organism; the hydrophobicity of the cell wall do not account for this characteristic of the organism.
