In which of the following pairs of organisms are both examples of invertebrates?

Rationale

Earthworm and squid are both examples of invertebrates.

Invertebrates are animals that lack a backbone or spinal column, comprising a significant majority of the animal kingdom. Both the earthworm and the squid fall into this category, as neither possess a backbone.

A (Bird and bat) YOUR ANSWER

Birds and bats are both vertebrates, not invertebrates. Birds belong to the class Aves, and bats belong to the class Mammalia. Both of these classes are part of the phylum Chordata, which comprises animals with a backbone.

B (Oyster and fish) YOUR ANSWER

While oysters are invertebrates, fish are not. Oysters belong to the phylum Mollusca, characterized by a soft unsegmented body and in most cases an external shell. Fish, on the other hand, are vertebrates, possessing a backbone and falling under the phylum Chordata.

C (Snake and snail) YOUR ANSWER

Snakes are vertebrates, while snails are invertebrates. Snakes are part of the class Reptilia and have a backbone, unlike snails which belong to the phylum Mollusca and lack a backbone.

D (Earthworm and squid) CORRECT

Earthworms and squids are both invertebrates. Earthworms belong to the phylum Annelida, characterized by segmented bodies. Squids, like oysters and snails, fall under the phylum Mollusca. Neither earthworms nor squids have a backbone, making them both invertebrates.

Conclusion

When considering whether an animal is an invertebrate or a vertebrate, the presence or absence of a backbone is the determining factor. Both earthworms and squids lack a backbone, classifying them as invertebrates. All other pairs provided contain at least one vertebrate, making them incorrect choices.

In which of the following pairs of organisms are both examples of invertebrates?

Earthworm and squid are both examples of invertebrates.

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