As everything in this world as some shortcoming , biology also has some exception and they are :
1. Reptile have 3 chambered heart but in case of crocodile they have 4 chambered heart.
2. Mammalain's RBC lacks nucleus except camel.
3. Plant root is considered to be non-green and non-photosynthetic but in case of tinospora they have green and photosunthetic root.
4. Virus lack cellular machinery
like cell organelle etc.
5. DNA, the genetic material is usually double stranded but in case some virus it is single stranded.
6. Mammals give direct birth to young ones, but spiny ant eater and duck billed platypus are egg laying animals.
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