A hospital microbiologist isolates a pathogenic cocci which grows in chains. Based on the shape and arrangement of cells, she concludes the pathogen is most likely a (Staphylococcus/Streptococcus/Enter ococcus).

Streptococcus

Explanation:

Coccus (plural cocci) bacteria are those that are oval or spherical in shape when viewed under a microscope. Coccus bacteria end up forming different shapes when they reproduce or multiply.

When they grow in clusters, they are referred to as Staphylococci, when in chains, they are streptococci and when they are arranged in pairs, they are diplococci. Enterococci are arranged in short chains or in pairs but usually gram positive in nature.

The correct option is streptococcus.

segmentation=endoskeleton=backbone=coelom=tissues

the answer will be a) proteins i believe