Sally's teacher asked her to classify the organisms in a sample of pond water. one key feature can be seen that sally rule out the kingdom eubacteria. that was the presence of a) cilia. b) cell wall. c) organelles. d) chlorophyll.

The correct answer is -

C) Organelles.

Organelles are the subcellular compartments present in the eukaryotes (such as plants and animal cells). They serve specialised functions to the cell. For example-  Mitochondria is used to generate large amount of energy in the form of ATP.

Organelles are absent in the prokaryotes such as organisms belonging to the domain Eubacteria like E.coli.

Thus, 'presence of organelle' is the key feature that helped Sally to rule out the kingdom Eubacteria.

a: the sheep and waste material both release carbon into the atmosphere.