There’s proteins (muscle) lipid (fat) calcium )bones) and carbohydrates (mostly for energy)
Answer:
Respiratory system and circulatory system.
The respiratory system allow living things to obtain oxygen from the air while the circulatory system allows oxygen to be carried around the body.
The correct answer in this question is option A. Biochemical analysis uses similarities in DNA sequences as evidence for evolutionary relationships. Scientists believed that two species with almost the same protein structure are more likely to have a closer relationship. DNA hybridization and gene sequencing are two types of analysis that can be used.
Assuming this is for AP Environmental Science.
There’s the nitrogen cycle that circulates nitrogen around the globe. However, human activities can affect it and add nitrogen into the atmosphere such as deforestation. Plants use nitrogen in order to thrive. If humans cut it down, the nitrogen inside it will come out. Natural forces such as light night can also create nitrogen.
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