Question

to which of the major groups of eukaryotes do diatoms belong?
a amoebozoa
b archaeplastida
c excavata
d stramenopila
e opisthokonta

Explanation:

Diatoms are unicellular algae with a unique silica - based cell wall. Stramenopila is a major group of eukaryotes that includes diatoms. Amoebozoa are amoeba - like organisms. Archaeplastida contains plants and red/green algae. Excavata has flagellated organisms. Opisthokonta includes animals, fungi, etc.

Answer:

D. Stramenopila