<span>The answer is tuber. The tuber is the modified stem enlarged for food storage and asexual reproduction. For instance, a potato is a tuber. The tuber provides nutrients for the growth in the next season so when spring comes, it regenerates new shoots.</span>
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.
It's very likely that the catcus with short spines will die out faster than the cactus with long spines.
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