The answer is D. Frog.
A cockroach, roundworm, and amoeba are all invertebrates, meaning they do not have a backbone. A frog, on the other hand, is a vertebrate. Invertebrates make up the vast majority of animals on Earth, and they come in a wide variety of shapes and sizes. Some invertebrates, such as insects, are very small, while others, such as squid, can be quite large. Invertebrates can be found in all sorts of habitats, from the oceans to the deserts.
Vertebrates are animals that have a backbone. This backbone is made up of bones that protect the spinal cord. Vertebrates also have a skull, which protects the brain. There are over 50,000 species of vertebrates, and they include mammals, birds, reptiles, amphibians, and fish. Vertebrates can be found on all seven continents.
Frogs are amphibians, which means they live both on land and in water. They have smooth, moist skin and no scales. Frogs lay their eggs in water, and the tadpoles that hatch from the eggs live in water for a while before they develop legs and lungs and can live on land. Frogs are found all over the world, except for Antarctica.
In conclusion, the answer to the question “Choose the word which is different from the rest. A. Cockroach B. Roundworm C. Amoeba D. Frog” is D. Frog. Frogs are vertebrates, while the other three options are invertebrates.