Question

As a practical definition of species, one can say that they are a group of organisms characterized by all of the following except they

• A. Do not normally interbreed with other species in nature
• B. Can be distinguished from other species
• C. Are incapable of hybridization with other species
• D. Remain relatively constant

Answer 1

Answer: (C)

Are incapable of hybridization with other species

• Species, the basic unit of classification in the hierarchical taxonomic system. A species is a group of similar organisms sharing a common gene pool and interbreeding freely, producing fertile offspring. Species occur in the form of many interbreeding groups called populations.
• A species don't interbreed with other species in nature, interbreeding of the organisms of same species produces fertile offspring, whereas interbreeding of different species produces sterile offspring. For example, horses and donkeys can interbreed, producing mules. Mules can't reproduce because of horses and donkeys are not same species, while they are close enough to interbreed, their offsprings are sterile.
• They remain isolated and can be distinguished from one another in specific characteristics.

So the correct option is they 'Are incapable of hybridization with other species'.