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8-biologist (n) sb who studies living things (biology :n, biological :adj)
9-fascinated (adj) very interested (fascinate :v, fascinating :adj)
10-actually (adv) used to emphasise a fact (actual :adj)

11- polyp (n) a tiny animal that lives in the sea
12- create (v) to make, cause to exist (creature, creation :n), creative :adj)
13- limestone (n) a rock that is made of calcium carbonate (CaCO3 )
14- nearly (adv) almost; not completely
15- structure (n) sth that has been built
16- visible (adj) that can be seen (visibility :n) (opp: invisible)

17- algae (n pl) simple plants without roots or stems that grow in or around water
18- although even though; used to introduce a clause of contrast (a conjunction
(conjunction) joins words or phrases or clauses together)
19- species (n) a type of plant or animal

20- provide (v) to give (provision :n)
21- however (adv) despite this fact
22- turn (v) to change and become different (turn :n)
23- discover (v) to find sb/sth that was hidden or unknown(discovery :n)
24- perhaps (adv) maybe
25- remains (n pl.) the pieces of sth/sb that are still visible when the other parts have

been destroyed, eaten or removed, etc. (remain :v)
26- valuable (adj) very useful because it is good for you (value :n, v)

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