21) which clade is composed of eukaryotes which are multicellular and heterotrophs? a. eubacteria eliminate b. fungi c. plant d. animals

There are two correct answers: fungi and animals.

Heterotrophic means that they cannot produce its own food. Fungi get their food by absorbing dissolved molecules and they have a possibility to secrete digestive enzymes into their environment. Animals consume organic material for their nutrition.  
Both are multicellular.

To kill bacteria from our body especially from stomach