at stake (phrase)
/æt steɪk/

likely to be lost or damaged if something fails

biodiversity (n)
 /ˌbaɪəʊdaɪˈvɜː(r)səti/

the variety of different types of plant and animal life in a particular region

carnivore (n)
/ˈkɑː(r)nɪvɔː(r)/

an animal that eats other animals

dolphin (n)
/ˈdɒlfɪn/

a large sea animal, similar to a fish, with a long nose

entrapment (n)
/ɪnˈtræpmənt/

catching in or as in a trap

gestation (n)
/dʒeˈsteɪʃ(ə)n/

the time during which a human or animal baby develops inside its mother

gulf (n)
/ɡʌlf/

a large area of sea that is almost surrounded by land

herbicide (n)
/ˈhɜː(r)bɪsaɪd/

a chemical used for killing weeds

jellyfish (n)
/ˈdʒeliˌfɪʃ/

a soft round sea animal that you can see through

krill (n)
/krɪl/

extremely small shellfish, eaten by whales

offspring (n)
/ˈɒfˌsprɪŋ/

the baby or babies of an animal

organism (n)
/ˈɔː(r)ɡəˌnɪz(ə)m/

a living thing such as a person, animal, or plant, especially an extremely small living thing

reveal (v)
/rɪˈviːl/

to let something become known

seal (n)
/siːl/

a large mammal that eats fish and lives partly in the sea and partly on land orice

shark (n)
/ʃɑː(r)k/

a large fish with sharp teeth that lives in the sea

sperm whale (n)
 /spɜː(r)m weɪl/

a large whale that is sometimes hunted for its oil and fat

starfish (n)
/ˈstɑː(r)ˌfɪʃ/

a small flat sea animal with five or more arms in the shape of a star

submarine (n)
/ˈsʌbməriːn/ 

a ship that can travel both on the surface of the water and under water

turtle (n)
/ˈtɜː(r)t(ə)l/

an animal with a shell and four short legs that lives mainly in the sea

whale (n)
 /weɪl/

a very large sea animal that breathes air through a hole on the top of its head