​1. Why Euglena is called plant-animal? Why whales are not grouped under fishes?  

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Whales don not lay eggs and gives birth to its young ones .So whale is catogarised under mamals
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Uglena is a protist that can both eat food and can photosynthesize. When acting as a heterotroph, the?Euglenasurrounds a particle of food and consumes it by phagocytosis. When acting as an autotroph, theEuglena?utilizes chloroplasts to produce sugars by photosynthesis. So it is called plant - animal
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HI,
As Euglena is a Hetrotrophic organism who can eat food as well as they can perform photosyenthesis process! so they consider as plant animals.

as whales are mammals who don't lays eggs as they gives birth to young ones ! so whales are not grouped under fishes.
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