Why do parasites need host?

Answer 1

They usually 'hide' in their host's body - so they remain undetected. Normally, they only consume enough nutrients to complete their life-cycle, but sometimes can have a detrimental affect on their host.

Answer 2

Well how would you feel if you had no host in your yard. pretty frickin akward

and because they happy o☺☺☺☺

the host is just a provider for something the parasite isn't designed to gather, but needs.

like an adult with kids. the kids are too young to fend for themselves. so, the parent/s provide for them to ease the growing process.

the parasite either provides something in return (like defense against other malicious parasites), or does so in hiding (by numbing the sensors of the host, etc) like blood cells. they gather oxygen and nutrients, and take them to other organisms in the body. all that in payment for the body providing for them a place to live, a relatively consistent temperature, and even other nutrients.

in other words, they need a host because it provides food and stuff so it can live

Answer 3

Actually, the very term 'parasite' implies that it drains resources from a host party. So in effect, the answer is just that.

Answer 4

The host helps the parasite.