Choose the correct word for each gap to complete the text The Earth is full of life. There are millions and billions of living organisms on our planet. In order to study them, scientists divide living organisms into groups or classes. Usually, the most important features and qualities are taken into account. The most known division is into vertebrates, the animals who have backbones, and invertebrates, those who don't. The first class is further divided into warm and cold-blooded. They include warm-blooded mammals and birds, and cold-blooded fish, amphibians and reptiles. The invertebrates are further divided into spiders and insects, which are not the same. Let's think about the most distinctive features that differentiate all the classes. The most important common thing among mammals is . It doesn't matter if a mammal is herbivorous (eating plants), carnivorous (eating meat) or omnivorous (eating both meat and plants), they all drink milk as babies. Mammals have warm blood. The birds are warm-blooded too. They lay eggs, they are covered with feathers and have even if they can't fly. Numerous insects have wings too, and they also lay eggs. Just like reptiles. Many reptiles, like snakes and some lizards, are covered with a kind of . Fish also have scales, but they don't have lungs and mostly can live only in water. The also live in water, but they can live on dry land too. It's possible because, in the development process, they grow to breathe. About 80–85% of all animals on our planet are...insects. To be exact, not only insects. There is a big variety of cold-blooded backboneless organisms with segmented bodies who have more than four legs or limbs. Insects mostly have six legs, spiders have eight, starfish have five to dozens, centipedes have hundreds. As far as you can see, the world of living organisms is very diverse and very complicated as well. There are features that make some classes different and other classes alike at the same time. You'll never get bored discovering the world of animals.
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Choose the correct word for each gap to complete the text

The Earth is full of life. There are millions and billions of living organisms on our planet. In order to study them, scientists divide living organisms into groups or classes. Usually, the most important features and qualities are taken into account.

The most known division is into vertebrates, the animals who have backbones, and invertebrates, those who don't. The first class is further divided into warm and cold-blooded. They include warm-blooded mammals and birds, and cold-blooded fish, amphibians and reptiles. The invertebrates are further divided into spiders and insects, which are not the same.

Let's think about the most distinctive features that differentiate all the classes. The most important common thing among mammals is [scale|wings|lungs|amphibians|blood|skin|milk]. It doesn't matter if a mammal is herbivorous (eating plants), carnivorous (eating meat) or omnivorous (eating both meat and plants), they all drink milk as babies. Mammals have warm blood. The birds are warm-blooded too. They lay eggs, they are covered with feathers and have [scale|wings|lungs|amphibians|blood|skin|milk] even if they can't fly. Numerous insects have wings too, and they also lay eggs. Just like reptiles. Many reptiles, like snakes and some lizards, are covered with a kind of [scale|wings|lungs|amphibians|blood|skin|milk]. Fish also have scales, but they don't have lungs and mostly can live only in water. The [scale|wings|lungs|amphibians|blood|skin|milk] also live in water, but they can live on dry land too. It's possible because, in the development process, they grow [scale|wings|lungs|amphibians|blood|skin|milk] to breathe.

About 80–85% of all animals on our planet are...insects. To be exact, not only insects. There is a big variety of cold-blooded backboneless organisms with segmented bodies who have more than four legs or limbs. Insects mostly have six legs, spiders have eight, starfish have five to dozens, centipedes have hundreds.

As far as you can see, the world of living organisms is very diverse and very complicated as well. There are features that make some classes different and other classes alike at the same time. You'll never get bored discovering the world of animals.

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