A topic sentence summarises the main idea in a paragraph.
Highlight the topic sentence in the paragraph below.
Jellyfish are unusual creatures. Jellyfish have no brain,
heart, bones or eyes. They are made up of a smooth,
bag-like body and tentacles armed with tiny, stinging cells.
These incredible invertebrates use their stinging tentacles
to stun or paralyse prey before gobbling it up. Did you
know a jellyfish's mouth is found in the centre of its body?