A _______ is an organism whose cells contain complex, membrane-bound structures called organelles. A. mitochondrion B. eukaryote C. nucleus D. vacuole

Respuesta :

B. eukaryote is an organism whose cells contain complex, membrane-bond structures called organelles. 
B. eukaryote
A eukaryote is an organism whose cells contain a nucleus within a membrane. Eukaryotes vary from single-celled organisms to complex multicellular animals and plants.