Answer:
It was slow.
Explanation:
Ambulocetus, an ancient whale ancestor, is known for its adaptation to an aquatic lifestyle. The other statements are true about Ambulocetus:
It could hear well underwater: Ambulocetus likely had well-adapted auditory abilities for hearing underwater, which would have been crucial for hunting and navigating in aquatic environments.
It lacked hind limbs: Ambulocetus had reduced hind limbs, a characteristic feature of early whale evolution as they transitioned from land to water. This adaptation helped in swimming efficiently.
Its teeth resemble modern whale teeth: Ambulocetus had teeth that resembled those of modern whales, which were suited for catching and consuming prey in aquatic environments.