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Amphibians and reptiles
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Amphibians Amphibians are vertebrates that live part of their lives in fresh water and part on land. Characteristics of amphibians The skin of amphibians is moist and slimy. It has no protective…
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Feeding and digestion in animals
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1.1. How do animals feed? Animals are heterotrophic; they need to find food and transform it to get nutrients. These substances provide energy and materials the animal needs to grow, make new tissues…
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Raising cows and producing milk - Work
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Cows Cows are vertebrates. Their body is covered in fur and they have a large udder, which produces milk. Cows' legs end in two toes. These are covered by a thick nail, called a hoof. How do we…
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Analyse. A text
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Polyembryony Polyembryony is a type of sexual reproduction in which an embryo fragments into several identical embryos. They each develop independently. The young of each litter are of the same sex, as…
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Structure of a tapeworm
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Adult tapeworms are intestinal parasites of vertebrates. They have a very simple structure. Tapeworms do not have a respiratory, circulatory or digestive system. Their body is ribbon-shaped, with a head…
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