D. Strong ....................
Answer:
I believe your answer is C.
The young of the cuckoo birds kill the other birds young and the parents of the other bird spices raises the cuckoo bird as its own leaving the European cuckoo bird who had laid the egg to continue with its life without having to raise its young.
For a long time scientist figured that the bones are so small because They are vestigial, a shrunken evolutionary remnant From an ancestor that once walked on land. But now scientists Have discovered that the tiny bones they actually play a huge role in whale reproduction.
Phytoplankton because they are producer(producer make their own food).