Used to map mid ocean ridge

In which of these cases are the two wave points considered to be in phase with each other?

What does the cell nucleus do or, how does it function?

Ants live on acacia trees in south america. the ants feed on sugars secreted by the trees. the trees provide room for the ants to live. the ants sting any other insect or animal that comes to eat the trees. what type of relationship is this?