It has taken millions of years for the ancestors of whales to change into what we know today, as indicated in the diagram below.   Based on your knowledge of evolution, which of the following is a reasonable explanation of why the organisms in the diagram changed over 25 million years? Question options:   As the environment changed the food sources became more difficult to obtain so characteristics that allowed the organisms to hunt in an aquatic environment became more advantageous.   As the environment changed the temperature became too hot and the organisms began to move to a more aquatic environment to keep cool.   As the environment changed the food sources became more difficult to obtain so the organisms decided to change their characteristics to ones that would be beneficial when hunting in an aquatic environment.   As the environment changed the predators on land became better adapted to hunting the whales ancestors forcing them to live in more aquatic environments.

Biology 2e
2nd Edition
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark
Chapter29: Vertebrates
Section: Chapter Questions
Problem 26CTQ: Why did gnathostomes replace most agnathans?
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It has taken millions of years for the ancestors of whales to change into what we know today, as indicated in the diagram below.

 

Based on your knowledge of evolution, which of the following is a reasonable explanation of why the organisms in the diagram changed over 25 million years?

Question options:

 

As the environment changed the food sources became more difficult to obtain so characteristics that allowed the organisms to hunt in an aquatic environment became more advantageous.

 

As the environment changed the temperature became too hot and the organisms began to move to a more aquatic environment to keep cool.

 

As the environment changed the food sources became more difficult to obtain so the organisms decided to change their characteristics to ones that would be beneficial when hunting in an aquatic environment.

 

As the environment changed the predators on land became better adapted to hunting the whales ancestors forcing them to live in more aquatic environments.

60 mya
Mesonychid
Ambulocetus
Rodhocetus
Basilosaurus
35 mya
Transcribed Image Text:60 mya Mesonychid Ambulocetus Rodhocetus Basilosaurus 35 mya
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