19.- Variation: The variation of animal species helps the ecosystem.
2.- Animals have undergone variations.
4.- Development: Jungle animals development hunting skills.
2.- The monkey development a lot of skills.
20.- Variety: In the jungle there is a great variety of animals.
2.- There is a great variety of birds in the worldThere is a great variety of birds in the world.
13.- Fossilization: Fossilization is a process that occurs over time.
2.- Scientists investigate the fossilization of animals.
3.- Develop: The tiger developed a good sense of smell.
2.- The animals have developed very well.
8.- Evolve: All species over time can evolve.
2.- To evolve is to experience change.
2.- Adaptation: The adaptation of the new animals of the Zoo goes very well.
2.- Natalia has a hard time adjusting to her new home.
12.- Fossilize: Dead animals can fossilize.
2.- Buried teeth and shells can fossilize
15.- Mutate: mutate is a natural process of some species
2.- Snakes can mutate skin several times a year.
10.- Extinct: The dinosaur is extinct.
2.- The prehistorics animals are extinct.
11.- Fossil: researchers found a fossil.
2.- in the museum there are many fossils.
5.- Diversity: In the jungle there is a lot of diversity of animals.
2.- In the zoo there is a diversity of animals to visit.
9.- Evolution: the elephant has undergone evolution
2.- evolution is a process of living beings
16.- Natural: Birds survive in their natural habitat.
2.- Eruptions are natural.
1.- Adapt: The parrot adapted to the environment of my house.
2.- The monkeys adapted to the Zoo environment.
14.- Habitat: The habitat of lions is savannah.
2.- Each species of animals has its own habitat.
7.- Environment: You have to take care of the environment.
2.- The environment is important.
6.- Diversify: Animals must be diversified.
2.- Animals are diversified.
17.- Survive: Some species manage to survive in different habitats.
2.- Some species can survive with our help.
18.- Survival: Survival is important for species.
2.- The survival of animals is important to humans.