A hormone is a regulatory molecule that is secreted into the blood by an endocrine gland
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<span>Living things are made of cells.Living things obtain and use energy.Living things grow and develop.Living things reproduce.Living things respond to their environment.<span>Living things adapt to their environment.</span></span>
Answer:
b. giving birth to live young (viviparous)
Explanation:
Monotremes include duck-billed platypus and few other mammalian species that are oviparous. These mammalian species do not give birth to young ones, that is, they are not viviparous. Rather they lay eggs and are oviparous.
These species are also characterized by the absence of teeth. The primitive monotremes also exhibit external fertilization.
Examples of egg-laying mammals include anteaters or echidnas and the duck-billed platypus. The laid eggs are carried by females in an abdominal ouch to keep them warm.