Multiple choice

Avascular type of allantois is seen in which of the following animals?

  1. Mouse

  2. Humans

  3. Marsupials

  4. Bandicoot

  5. All of the above

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In most marsupials, the allantois is avascular, having no blood vessels  but still serves the purpose of storing nitrogenous (NH3) waste.