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biological clock
My biological clock is disrupted, and I've been having sleepless nights.
invasive species
Invasive species can have a major impact on the natural environment.
zoo; zoological garden
We went to the zoo with our family on the weekend.
vertebrate
Vertebrates are organisms whose part of the skeleton is composed of a spine.
wild animal, wildlife
Wild animals are part of nature, and we should protect them.
zoophobia
She has zoophobia, and runs away as soon as she sees dogs or cats.
experiments on animals
Animal experiments are necessary for the advancement of science, but there are also ethical issues.
experimental animal
He is learning about the handling of experimental animals.
Kyūjitai form of 動物学 (“zoology”).
He is majoring in zoology at university.
mammal
Mammals can maintain a constant body temperature.
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