Verified answer

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1. The smallest mammal in the world is the bumblebee bat (Craseonycteris thonglongyai).

2. The mammal that lays eggs is the platypus (Ornithorhynchus anatinus) and echidnas (spiny anteaters).

Answer:

1. The bumblebee bat(Craseonycteris thonglongyai) is the smallest mammal in the world.
2. Platypus and Echidna are warm-blooded animals. They belong to Mammalia because they have hair on their body and produce milk from mammary glands to feed their young ones. However, they lay eggs without giving birth to young ones.