1.There are _ big groups of animals based on the absence and presence of backbone.
a. 1
b. 2
c. 3
d. 4
Explanation:
The animals have been divided into two groups based on the presence or absence of a backbone. The backbone is the observable feature that defines whether the animal is a vertebrate or an invertebrate.
Answers & Comments
Answer:
1.There are _ big groups of animals based on the absence and presence of backbone.
a. 1
b. 2
c. 3
d. 4
Explanation:
The animals have been divided into two groups based on the presence or absence of a backbone. The backbone is the observable feature that defines whether the animal is a vertebrate or an invertebrate.
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Answer:
B. 2
Explanation:
vertebrates and invertebrates
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