Concept explainers
Introduction:
Animals are multicellular, heterotrophic, sexually reproducing organisms that are capable of locomotion.

Answer to Problem 1U
Correct answer:
Lack of cell wall is a characteristic unique to all the animals. Therefore, option c. is correct.
Explanation of Solution
Reason for the correct statement:
Animals differ from all other multicellular organisms in one aspect that are they lacking a rigid cell wall. All other multicellular organisms such as plants,
Option c. is given as “Lack of cell walls”.
As, “the characteristic unique to all animals is lack of cell walls in their cells”, is the right answer.
Hence, option c. is correct.
Reason for the incorrect statements:
Option a. is given as “Sexual reproduction”.
Sexual reproduction is not unique to animals as it can be seen in other organisms also such as plants and fungi. So, it is a wrong answer.
Option b. is given as “Multicellularity”.
Multicellularity is not unique to animals as it can be seen in plants and fungi also. So, it is a wrong answer.
Option d. is given as “Heterotrophy”.
Heterotrophy is not unique to animals as it can be seen in other organisms also such as fungi. So, it is a wrong answer.
Hence, options a., b., and d. are incorrect.
The lack of cell walls is a characteristic unique to the animals.
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Chapter 33 Solutions
BIO 1406/07 W/CONNECT/LM NEW >IC<
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