seal /siːl/ (verb) to close an envelope , etc. by sticking the edges of the opening together Example: Now, we can see many seals at some aquariums.
reveal /rɪˈviːl/ (verb) to make something known to somebody Example: He was jailed for revealing secrets to the Russians.
Dolphin /ˈdɑːlfɪn/ (noun) a sea animal (a mammal ) that looks like a large fish with a pointed mouth. Dolphins are very intelligent and often friendly towards humans. There are several types of dolphin . Example: Dolphins are sometimes hunted in places such as Japan
Shark /ʃɑːrk/ (noun) a large sea fish with very sharp teeth and a pointed fin on its back. There are several types of shark , some of which can attack people swimming. Example: Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton
Turtle /ˈtɜːrtl/ (noun) a large reptile with a hard round shell that lives in the sea Example: Turtles have appeared in myths and folktales around the world.
Whale /weɪl/ (noun) a very large animal that lives in the sea and looks like a very large fish. There are several types of whale , some of which are hunted. Example: Whales are a widely distributed and diverse group of fully aquatic placental marine mammals.
jellyfish /ˈdʒelifɪʃ/ (noun) a sea creature with a body like jelly and long thin parts called tentacles that can give a sharp sting (= a painful wound on the skin) Example: The jellyfish is a sea animal with a soft oval almost transparent body.
biodiversity /ˌbaɪəʊdaɪˈvɜːrsəti/ (noun) the existence of a large number of different kinds of animals and plants which make a balanced environment Example: A new National Biological Survey will protect species habitat and biodiversity.
gulf /ɡʌlf/ (noun) a large area of sea that is partly surrounded by land Example: A gulf is another name for a large bay.
at stake /ət steɪk/ (phrase) Example: Thousands of lives will be at stake if emergency aid does not arrive in the city soon.
carnivore /ˈkɑːrnɪvɔːr/ (noun) any animal that eats meat Example: Lions and tigers are carnivores.
entrapment /ɪnˈtræpmənt/ (noun) the illegal act of tricking somebody into committing a crime so that they can be arrested for it Example: Sperm whale populations are at risk due to hunting and their accidental entrapment in fishing nets.
gestation /dʒeˈsteɪʃn/ (noun) the time that the young of a person or an animal develops inside its mother’s body until it is born; the process of developing inside the mother’s body Example: The gestation period of rats is 21 days.
herbicide /ˈɜːrbɪsaɪd/ (noun) a chemical that is poisonous to plants, used to kill plants that are growing where they are not wanted Example: Herbicides are widely used in agriculture to kill unwanted plants.
krill /krɪl/ (noun) very small shellfish that live in the sea around the Antarctic and are eaten by whales Example: Krill are very small animals with a hard outer shell which live in the sea and are eaten in large numbers by some types of whale.
offspring /ˈɔːfsprɪŋ/ (noun) a child of a particular person or couple Example: In the case of the Guinea pig, the number of offspring varies between two and five.
organism /ˈɔːrɡənɪzəm/ (noun) a living thing, especially one that is extremely small Example: Amoebae and bacteria are single-celled organisms.
sperm whale /ˈspɜːrm weɪl/ (noun) a large whale that is hunted for its oil and fat Example: The sperm whale is a large whale with a very large long head.
starfish /ˈstɑːrfɪʃ/ (noun) a flat sea creature in the shape of a star with five arms Example: The starfish is a beautiful fish.
submarine /ˌsʌbməˈriːn/ (noun) a ship that can travel underwater Example: A submarine can travel underwater.