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1.Protein: large biomolecules that consist of one or more long chains of amino acid.
Lipids: naturally occurring molecules that include fats, waxes, and steroids.
Carbohydrates: biological molecule that consists of carbon, hydrogen, and oxygen  atoms.
Nucleic acid:  organic substance  present in living cells especially in DNA or RNA.
2. Elements: CHONPS stands for carbon, hydrogen, oxygen, nitrogen, phosphorus, sulfur.
3. Nucleic acid is the second type of bio molecules.

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1. The low energy transfer
rate between trophy levels makes decomposers generally are important than producers.
2.  Autotroph:  is an organism that  produces complex organic compounds from simple substances in its surroundings.
3.  Heterotroph:  is an organism that cannot fix carbon from inorganic sources.
4. Herbivore:  an animal that eats plants.
Carnivore: an animal that eats on flesh.
Omnivore: an animal that eats foods of both animals and plants.
5. Decomposers: an organism that decomposes organic material.
6. The amount of energy at each trophic level decreases a it moves through an ecosystem.
7. 10% of energy at any trophic level is transferred to the next level.

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1. Cellular respiration: a set of metabolic reactions and processes that can take place in the cells of organisms to convert biochemical energy from nutrients.
2. Photosynthesis makes glucose and is used in cellular respiration to make ATP.
3. CO2 is primarily greenhouse gas emitted through human activities.

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1. law of conservation of matter: any system closed to all transfers  of matter and energy, the mass of the system must remain costa over time.
2. Law of conservation of energy: total amount of energy remains constant in isolated system.
3. Laws of conservation of mass energy: energy can neither be created nor destroyed but can be changed from one to another.

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1. Plants use outputs of photosynthesis(sugar and oxygen) as the inputs of cellular respiration.
2. The chemical formula is 6CO2 + 6H2O + light energy = C6H1206 + 6O2.
3.  Chloroplast:  contains chlorophyll and takes place in photosynthesis.

4. Light dependent cycle:  takes place in the thylakoid membrane and use light energy to make ATP and NADPH.
5.  Calvin cycle: takes place in photosynthesis and carries (ATP and NADPH)  that are products of light dependent reactions.
6. Light energy is converted
to chemical energy when photochemically excited special chlorophyll molecule of the photosynthetic reaction c enter loses an election and undergoing a oxidation reaction.