Ok first of you need to know what a lipid is. A lipid is <span>a class of organic compounds that are fatty acids or their derivatives and are insoluble in water but soluble in organic solvents. This includes waxes, steroids etc. Lipids are important for living cells. Together with carbohydrates and proteins, lipids are the main constituents of plant and animal cells. Cholesterol and triglycerides are also considered lipids. </span>
<span>So I would go with C. </span>
<span>Hope I helped. :) </span>
A hypothesis is a testable possible explanation, while a theory is an explanation that has been tested extensively.
If you need to learn more and remember about this stuff better, watch the Amoeba Sister's <em>Casual and Scientific Use of "Theory" and "Law"</em>. Trust me, it helps!
:)I hope I answered your question well!:)
Answer:
1. Carbon is moving from the living things in the tank into the air when they respirate, and from the air back into plants via photosynthesis
2. The amount of carbon in living things is increasing as plants use the carbon in the atmosphere, and animals eat the plants.
Explanation:
According to the question, a well sealed tank contains air, plants and animals. Since light can get into the tank, plants can perform photosynthesis. Living things in the tank release carbon in form of carbondioxide (CO2) gas through respiration. Plants then make use of this carbondioxide (CO2) to synthesize carbon-containing food (glucose) in the presence of sunlight. This process is called PHOTOSYNTHESIS.
Animals eat those plants and the stored carbon in the plants gets transferred to them. The animals release this carbon into the air again in the form of carbondioxide when they respire. Hence, carbon in the tank moves from the living things (respiration) into the air and back into plants (photosynthesis).
2. Since the amount of carbon in the air is decreasing, the carbon is being used by the living things in the tank. Plants absorb the carbon in the atmosphere for photosynthesis, then animals eat the plants to get the carbon. Therefore, the amount of carbon in the living things is increasing.
