There are four different types of writing: expository, persuasive, descriptive and narrative. While one could say that descriptive could describe a particular subject, craft, or occupation, descriptive writing is more for describing a character, event, or special place. Persuasive is trying to persuade your audience to think one way, and narrative is used to tell a story. Expository writing is used to communicate specific information about a particular subject, craft, or occupation.
One species(the parasite) benefits while the other species (the host) is harmed
Since the sentences are not provided in this question a probable answer will serve to address. "Initiation" is defined as the start or the beginning of something, a commencement of a certain action/behavior. Moreover, initiation here could mean of something that will assess the ability or capacity of the individual before becoming a member of a peer group or certain community.
The plates crash into each other and push each other up until they form volcanoes. something like that