Answer:
d. Males have venom glands on a spur on their hind feet.
Step-by-step explanation:
- A duck-billed platypus is a mammal which lays eggs and lives in the semiaquatic environment.
- The duck-billed platypus has several unique adaptations that allow it to survive in the deciduous forests and one of them is the presence of the venom glands on the spur.
- The venom consists of the defensin like proteins which cause the lysis of several bacterias and viruses and at the same time can cause excruciating pain to the animals if stung. This offeres it protection in the forests.