Which description correctly characterizes animals (Kingdom Animalia)?

Which description correctly characterizes animals (Kingdom Animalia)?

• A. Prokaryotic, Haploid, Unicellular, Autotrophic Aerobes
• B. Eukaryotic, Diploid, Multicellular, Heterotrophic Aerobes
• C. Eukaryotic, Haploid, Multicellular, Autotrophic
• D. Prokaryotic, Diploid, Multicellular, Heterotrophic Anaerobes

Answer: (B)

Animals are eukaryotic, multicellular organisms that obtain energy by consuming other organisms (heterotrophs). In animals, the body cells are diploid, and the typical life cycle features a dominant diploid stage with haploid gametes produced by meiosis, which fuse during fertilization to form a new diploid individual. They generally rely on aerobic metabolism, using oxygen. This combination accurately describes animals. The other descriptions mix conditions that don’t fit animals, such as organisms lacking a nucleus (prokaryotic), being unicellular, or being autotrophic (capable of photosynthesis) or anaerobic (not requiring oxygen).

Animals are eukaryotic, multicellular organisms that obtain energy by consuming other organisms (heterotrophs). In animals, the body cells are diploid, and the typical life cycle features a dominant diploid stage with haploid gametes produced by meiosis, which fuse during fertilization to form a new diploid individual. They generally rely on aerobic metabolism, using oxygen. This combination accurately describes animals.

The other descriptions mix conditions that don’t fit animals, such as organisms lacking a nucleus (prokaryotic), being unicellular, or being autotrophic (capable of photosynthesis) or anaerobic (not requiring oxygen).