Mary has written an article about an endangered species. Read her article and complete it with the parts of the sentences below.

Write one letter in each gap.

Whales

Whales can be [ ]. They communicate using complex and mysterious sounds. Their size amazes us: the blue whale can [ ] 100 feet and weigh up to 200 tons. Impressive, isn't it?

Despite living in the water, whales breathe air. And like humans, they [ ] who nurse their babies.

Some whales are known as baleen whales, including blue, right, bowhead, sei, and grey whales. This [ ] that they have special bristle-like structures in their mouths (called baleen) that strain food from the water. Other whales, such as belugas and cachalots, have teeth. These [ ], that's why volunteers organise different supportive activities and raise money for help.

A. animals need protection

B. refers to the fact

C. found in all of the world's oceans

D. reach lengths of more than

E. are warm-blooded mammals