Final answer:
Based on your knowledge of the cell structures of living things, one reason viruses are not considered alive is all above (1) They lack chloroplasts 2) They lack nuclei 3) They lack cell walls 4) They lack cell membranes)
Step-by-step explanation:
Virus is an acellular biological entity that lacks a cellular structure, making it distinct from living organisms. It does not possess the components of cells such as organelles, ribosomes, and plasma membrane, which are common to all living things. Viruses cannot replicate on their own and instead rely on infecting host cells to synthesize their proteins and replicate their genetic material.
Viruses are missing key characteristics that define living organisms, including the ability to maintain homeostasis, perform metabolism, and respond to the environment. They also lack nuclei, which are present in all cells. While viruses do contain genetic material in the form of DNA or RNA, this alone does not classify them as living.
In conclusion, viruses are not considered alive because they lack essential cellular components, reproduction capabilities, metabolic processes, and the ability to maintain homeostasis. They rely on host cells for replication and lack key features that define living organisms. Therefore the correct answer is all above ( 1) They lack chloroplasts 2) They lack nuclei 3) They lack cell walls 4) They lack cell membranes)