Question

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page 9 of 10
question 9
animals that lack a backbone are referred to as:
a monotremes
b invertebrates
c fish
d marsupials
e cartilaginous

Explanation:

• Monotremes are egg - laying mammals.
• Fish are vertebrates (have a backbone).
• Marsupials are mammals with a pouch.
• Cartilaginous refers to having a cartilage - based skeleton (but still vertebrates in some cases like sharks, which have a backbone - like structure made of cartilage).
• Invertebrates are animals without a backbone.

Answer:

B. Invertebrates