Which of the following organisms groups was originally considered an animal by zoologists (animal biologists), since it can move rapidly like an animal and consumes other organisms for food, and was also claimed to be a plant by botanists (plant biologists) since it can consume energy much like a plant?

a. amoeba

b. paramecium

c. volvox

d. euglena

EUGLENA Is the organism that belongs to both the plant and animal due to Flagellum and the chloroplast.

Explanation:

Euglena is a peculiar organism and a small genus of unicellular protists. It lives in the fresh and brackish water and sometimes found in the moist soils too.They can locomote through the single flagellum which is seen to be a long whip-like structure. Euglena possesses the characteristics of both the plant and the animal.As viewed in plants view it has the chloroplasts which are helpful for  the photosynthesis which provides energy for the  organism known as Autotrophs.As viewed in animal view it can consume energy heterotrophically by moving with the help of flagellum.

The answer would be c