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1: Burning of fossil fuel
2: Deforestation
3: Waste disposal in landfills
Explanation:
Burning of fossil fuel is the one of the primary cause of increased level of carbon dioxide in air. Deforestation refers to uncontrolled cutting down of trees which in turn increases the level of carbon dioxide in air. Plants are the natural resources that remove the carbon dioxide from air through the process of photosynthesis. Waste disposals in landfills emits methane which is one of the greenhouse gas.
Answer:
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Carbon-based macro molecules are found in all life forms.
Answer:
Asexual reproduction can be described as a method of reproduction in which only one parent is involved. The offsprings produced as a result of asexual reproduction are identical to their parent. Hence, limited evolution occurs in these organisms over a period of time. A bacterial cell reproduces by binary fission. In such kind of asexual reproduction, the parent cell splits into two daughter cells which are similar to the parent cell.
Sexual reproduction can be described as a method of reproduction in which two parents are involved. The offsprings are not usually similar to the parents due to the recombination. Sexual reproduction occurs by the process of meiosis. The recombinations that occur in such kind of reproduction brings variations among species.
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What is a controlled experiment? This is when a hypothesis is scientifically tested. In a controlled experiment, an independent variable (the cause) is systematically manipulated and the dependent variable (the effect) is measured; any extraneous variables are controlled.
Explanation:
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