Answer:
The correct option is A. they evolved from land mammals.
Explanation:
Evolution can be described as a process through which organisms in a species change over a period of time due to the natural selection of the environment. Those organisms that have many similarities in their functions or structures are considered closer to one another and have the same common ancestors.
The properties mentioned in the question about cetaceans resembles the properties of land mammals. For example, cetaceans lack gills and breathe air. Land mammals also do not have gills and need to respire for living. The cetaceans have fin bones which are similar to the limb bones in the land mammals. Hence, these observations show that cetaceas have evolved from land mammals.
Answer: The answers are C, D, and F
Explanation: The Asteroid Redirect mission's spacecraft will collect a boulder from an asteroid and research more.
The base of an adenine molecule is made of ribose sugar molecules
Primary succession starts with bare rock which is broken down by either lichen or moss to make soil while secondary succession starts with developed soil
