Single ring structures known as pyrimidines
Answer:
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Explanation:
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The answer is; D
Archaebacteria are early life forms on earth. They utilized the process of chemosynthesis to make organic molecules from inorganic molecules and for energy. The word archae means ‘ancient’ life forms. These single-celled organisms evolved around sulfur-rich environments of the hydrothermal vents.
Lungs and skin can also be part of the excretory system due to fact that they both excrete wastes.
Skin secretes excess water and salts
Your lungs help you get rid of waste gases
Red-Billed Hornbill Predator-Prey Relationships Lion-Mouse Meerkat-Insect Hyena-Lion<span>Circle</span>
